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Traub-Weidinger T, Arbizu J, Barthel H, Boellaard R, Borgwardt L, Brendel M, Cecchin D, Chassoux F, Fraioli F, Garibotto V, Guedj E, Hammers A, Law I, Morbelli S, Tolboom N, Van Weehaeghe D, Verger A, Van Paesschen W, von Oertzen TJ, Zucchetta P, Semah F. EANM practice guidelines for an appropriate use of PET and SPECT for patients with epilepsy. Eur J Nucl Med Mol Imaging 2024; 51:1891-1908. [PMID: 38393374 PMCID: PMC11139752 DOI: 10.1007/s00259-024-06656-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 02/13/2024] [Indexed: 02/25/2024]
Abstract
Epilepsy is one of the most frequent neurological conditions with an estimated prevalence of more than 50 million people worldwide and an annual incidence of two million. Although pharmacotherapy with anti-seizure medication (ASM) is the treatment of choice, ~30% of patients with epilepsy do not respond to ASM and become drug resistant. Focal epilepsy is the most frequent form of epilepsy. In patients with drug-resistant focal epilepsy, epilepsy surgery is a treatment option depending on the localisation of the seizure focus for seizure relief or seizure freedom with consecutive improvement in quality of life. Beside examinations such as scalp video/electroencephalography (EEG) telemetry, structural, and functional magnetic resonance imaging (MRI), which are primary standard tools for the diagnostic work-up and therapy management of epilepsy patients, molecular neuroimaging using different radiopharmaceuticals with single-photon emission computed tomography (SPECT) and positron emission tomography (PET) influences and impacts on therapy decisions. To date, there are no literature-based praxis recommendations for the use of Nuclear Medicine (NM) imaging procedures in epilepsy. The aims of these guidelines are to assist in understanding the role and challenges of radiotracer imaging for epilepsy; to provide practical information for performing different molecular imaging procedures for epilepsy; and to provide an algorithm for selecting the most appropriate imaging procedures in specific clinical situations based on current literature. These guidelines are written and authorized by the European Association of Nuclear Medicine (EANM) to promote optimal epilepsy imaging, especially in the presurgical setting in children, adolescents, and adults with focal epilepsy. They will assist NM healthcare professionals and also specialists such as Neurologists, Neurophysiologists, Neurosurgeons, Psychiatrists, Psychologists, and others involved in epilepsy management in the detection and interpretation of epileptic seizure onset zone (SOZ) for further treatment decision. The information provided should be applied according to local laws and regulations as well as the availability of various radiopharmaceuticals and imaging modalities.
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Affiliation(s)
- Tatjana Traub-Weidinger
- Division of Nuclear Medicine, Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Javier Arbizu
- Department of Nuclear Medicine, University of Navarra Clinic, Pamplona, Spain
| | - Henryk Barthel
- Department of Nuclear Medicine, Leipzig University Medical Centre, Leipzig, Germany
| | - Ronald Boellaard
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, Location VUmc, Amsterdam, The Netherlands
| | - Lise Borgwardt
- Department of Clinical Physiology and Nuclear Medicine, University of Copenhagen, Blegdamsvej 9, DK-2100, RigshospitaletCopenhagen, Denmark
| | - Matthias Brendel
- Department of Nuclear Medicine, Ludwig Maximilian-University of Munich, Munich, Germany
- DZNE-German Center for Neurodegenerative Diseases, Munich, Germany
- Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| | - Diego Cecchin
- Nuclear Medicine Unit, Department of Medicine-DIMED, University-Hospital of Padova, Padova, Italy
| | - Francine Chassoux
- Université Paris-Saclay, CEA, CNRS, Inserm, BioMaps, 91401, Orsay, France
| | - Francesco Fraioli
- Institute of Nuclear Medicine, University College London (UCL), London, UK
| | - Valentina Garibotto
- Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospitals, Geneva, Switzerland
- NIMTLab, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Center for Biomedical Imaging (CIBM), Geneva, Switzerland
| | - Eric Guedj
- APHM, CNRS, Centrale Marseille, Institut Fresnel, Timone Hospital, CERIMED, Nuclear Medicine Department, Aix Marseille Univ, Marseille, France
| | - Alexander Hammers
- School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and Medicine, King's College London & Guy's and St Thomas' PET Centre, King's College London, London, UK
| | - Ian Law
- Department of Clinical Physiology and Nuclear Medicine, Rigshospitalet, University of Copenhagen, Blegdamsvej 9, DK-2100, Copenhagen, Denmark
| | - Silvia Morbelli
- Nuclear Medicine Unit, IRCCS Ospedale Policlinico San Martino, Department of Health Sciences (DISSAL), University of Genoa, Genoa, Italy
| | - Nelleke Tolboom
- Department of Radiology and Nuclear Medicine, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | | | - Antoine Verger
- Department of Nuclear Medicine and Nancyclotep Imaging Platform, CHRU Nancy, Université de Lorraine, IADI, INSERM U1254, Nancy, France
| | - Wim Van Paesschen
- Laboratory for Epilepsy Research, KU Leuven and Department of Neurology, University Hospitals, Leuven, Belgium
| | - Tim J von Oertzen
- Depts of Neurology 1&2, Kepler University Hospital, Johannes Kepler University, Linz, Austria
| | - Pietro Zucchetta
- Nuclear Medicine Unit, Department of Medicine-DIMED, University-Hospital of Padova, Padova, Italy
| | - Franck Semah
- Nuclear Medicine Department, University Hospital, Inserm, CHU Lille, U1172-LilNCog-Lille, F-59000, Lille, France.
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Sabadell V, Trébuchon A, Alario FX. An exploration of anomia rehabilitation in drug-resistant temporal lobe epilepsy. Epilepsy Behav Rep 2024; 27:100681. [PMID: 38881885 PMCID: PMC11178986 DOI: 10.1016/j.ebr.2024.100681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 05/15/2024] [Accepted: 05/27/2024] [Indexed: 06/18/2024] Open
Abstract
Around 40% of patients who undergo a left temporal lobe epilepsy (LTLE) surgery suffer from anomia (word-finding difficulties), a condition that negatively impacts quality of life. Despite these observations, language rehabilitation is still understudied in LTLE. We assessed the effect of a four-week rehabilitation on four drug-resistant LTLE patients after their surgery. The anomia rehabilitation was based on cognitive descriptions of word finding deficits in LTLE. Its primary ingredients were psycholinguistic tasks and a psychoeducation approach to help patients cope with daily communication issues. We repeatedly assessed naming skills for trained and untrained words, before and during the therapy using an A-B design with follow-up and replication. Subjective anomia complaint and standardized language assessments were also collected. We demonstrated the effectiveness of the rehabilitation program for trained words despite the persistence of seizures. Furthermore, encouraging results were observed for untrained items. Variable changes in anomia complaint were observed. One patient who conducted the protocol as self-rehabilitation responded similarly to the others, despite the different manner of intervention. These results open promising avenues for helping epileptic patients suffering from anomia. For example, this post-operative program could easily be adapted to be conducted preoperatively.
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Affiliation(s)
| | - Agnès Trébuchon
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France
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Fargier R, Laganaro M. Referential and inferential production across the lifespan: different patterns and different predictive cognitive factors. Front Psychol 2023; 14:1237523. [PMID: 38022984 PMCID: PMC10643179 DOI: 10.3389/fpsyg.2023.1237523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 09/18/2023] [Indexed: 12/01/2023] Open
Abstract
Introduction The ability to speak is grounded in general memory and control processes and likely changes across the lifespan. However, our knowledge on how word production abilities naturally evolve from childhood to old age remains marginally investigated. Our aim was to shed further light on this issue by exploiting the contrast between two ways to elicit word production: referential picture naming and inferential naming from definition. Methods We collected accuracy and production latencies in a picture naming task and in a naming from definition task from 130 participants ranging from 10 to 80 years old. Measures of vocabulary size, digit span memory, semantic and phonemic fluencies and processing speed were also collected. We used multivariate adaptative regression splines and regression models to characterize lifespan patterns of the two tasks. Results Patterns of increase in performance were similar for picture naming and naming from definition only from childhood to young adulthood. In the second half of the lifespan, significant decrease of performance was found in older adults for picture naming (from around 60 years-old) but not for naming from definition. Clearly, word production elicited with an inferential task (naming from definition) yields different age-related patterns than usually described in the literature with a referential task (picture naming). Discussion We discuss how cognitive processes such as visual-conceptual processes and lexical prediction may explain the differential pattern of results in aging in referential and inferential production tasks. We argue for more lifespan studies and the need to investigate language production beyond picture naming, in particular with respect to aging.
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Affiliation(s)
| | - Marina Laganaro
- Neuropsycholinguistics Laboratory, Faculty of Psychology and Educational Sciences, University of Geneva, Geneva, Switzerland
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Mhanna A, Bruss J, Sullivan AW, Howard MA, Tranel D, Boes AD. Anterolateral temporal lobe localization of dysnomia after temporal lobe epilepsy surgery. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2023:2023.09.18.23295718. [PMID: 37790577 PMCID: PMC10543244 DOI: 10.1101/2023.09.18.23295718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
Objectives To evaluate what factors influence naming ability after temporal lobectomy in patients with drug-resistant epilepsy. Methods 85 participants with drug-resistant epilepsy who underwent temporal lobe (TL) resective surgery were retrospectively identified (49 left TL and 36 right TL). Naming ability was assessed before and >3 months post-surgery using the Boston Naming Test (BNT).Multivariate lesion-symptom mapping was performed to evaluate whether lesion location related to naming deficits. Multiple regression analyses were conducted to examine if other patient characteristics were significantly associated with pre-to post-surgery changes in naming ability. Results Lesion laterality and location were important predictors of post-surgical naming performance. Naming performance significantly improved after right temporal lobectomy ( p = 0.015) while a decrement in performance was observed following left temporal lobectomy ( p = 0.002). Lesion-symptom mapping showed the decline in naming performance was associated with surgical resection of the anterior left middle temporal gyrus (Brodmann area 21, r =0.41, p = <.001). For left hemisphere surgery, later onset of epilepsy was associated with a greater reduction in post-surgical naming performance ( p = 0.01). Significance There is a wide range of variability in outcomes for naming ability after temporal lobectomy, from significant improvements to decrements observed. If future studies support the association of left anterior middle temporal gyrus resection and impaired naming this may help in surgical planning and discussions of prognosis.
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Hadidane S, Lagarde S, Medina-Villalon S, McGonigal A, Laguitton V, Carron R, Scavarda D, Bartolomei F, Trebuchon A. Basal temporal lobe epilepsy: SEEG electroclinical characteristics. Epilepsy Res 2023; 191:107090. [PMID: 36774667 DOI: 10.1016/j.eplepsyres.2023.107090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Revised: 12/16/2022] [Accepted: 01/12/2023] [Indexed: 01/27/2023]
Abstract
OBJECTIVE Temporal lobe epilepsy is the most common type of focal drug-resistant epilepsy. Seizures with predominant involvement of basal temporal regions (BTR) are not well characterized. In this stereo electroencephalography (SEEG) study, we aimed at describing the ictal networks involving BTR and the associated clinical features. METHODS We studied 24 patients explored with SEEG in our center with BTR sampling. We analyzed their seizures using a quantitative method: the "epileptogenicity index". Then we reported the features of the patients with maximal epileptogenicity within BTR, especially ictal network involved, ictal semiology and post-surgical outcome. RESULTS We found that rhinal cortex, parahippocampal cortex and posterior fusiform gyrus were the most epileptogenic structures within the BTR (mean EI: 0.57, 0.55, 0.54 respectively). Three main groups of epileptogenic zone organization were found: anterior (23% of total seizures) posterior (30%) and global (47%, both anterior and posterior). Contralateral spread was found in 35% of left seizures and 20% of right seizures. Naming deficit was more prevalent in left BTR (71% vs 29% in right seizures; p = 0.01) whereas automatic speech production was preferentially represented in right seizures (11% vs 54%; p = 0.001). Surgery was proposed for 11 patients (45.8%), leading to seizure freedom in 72% (Engel Class I). One patient presented post-operative permanent functional deficit. CONCLUSION Basal-temporal lobe epilepsy seems to be a specific entity among the temporal epilepsy spectrum with specific clinical characteristics. Resective surgery can be proposed with good outcomes in a significant proportion of patients and is safe provided that adequate language assessment has been preoperatively made.
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Affiliation(s)
- S Hadidane
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Timone Hospital, Epileptology Department, Clinical Neurophysiology, Marseille, France
| | - S Lagarde
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Timone Hospital, Epileptology Department, Clinical Neurophysiology, Marseille, France
| | - S Medina-Villalon
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France
| | - A McGonigal
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France
| | - V Laguitton
- APHM, Timone Hospital, Epileptology Department, Clinical Neurophysiology, Marseille, France
| | - R Carron
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Timone Hospital, Stereotactic and Functional Neurosurgery, Marseille, France
| | - D Scavarda
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Timone Hospital, Pediatric, Neurosurgery Department, Marseille, France
| | - F Bartolomei
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Timone Hospital, Epileptology Department, Clinical Neurophysiology, Marseille, France
| | - A Trebuchon
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Timone Hospital, Epileptology Department, Clinical Neurophysiology, Marseille, France; INSERM UMR1106, Institut des Neurosciences des Systèmes, Aix-Marseille Université, Faculté de Médecine Timone, 27, Bd Jean-Moulin, 13385 Marseille Cedex 05, France; Service de Neurophysiologie Clinique, Hôpital de la Timone, 13005 Marseille, France.
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Snyder KM, Forseth KJ, Donos C, Rollo PS, Fischer-Baum S, Breier J, Tandon N. Critical role of the ventral temporal lobe in naming. Epilepsia 2023; 64:1200-1213. [PMID: 36806185 DOI: 10.1111/epi.17555] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 02/16/2023] [Accepted: 02/17/2023] [Indexed: 02/22/2023]
Abstract
OBJECTIVE Lexical retrieval deficits are characteristic of a variety of different neurological disorders. However, the exact substrates responsible for this are not known. We studied a large cohort of patients undergoing surgery in the dominant temporal lobe for medically intractable epilepsy (n = 95) to localize brain regions that were associated with anomia. METHODS We performed a multivariate voxel-based lesion-symptom mapping analysis to correlate surgical lesions within the temporal lobe with changes in naming ability. Additionally, we used a surface-based mixed-effects multilevel analysis to estimate group-level broadband gamma activity during naming across a subset of patients with electrocorticographic recordings and integrated these results with lesion-deficit findings. RESULTS We observed that ventral temporal regions, centered around the middle fusiform gyrus, were significantly associated with a decline in naming. Furthermore, we found that the ventral aspect of temporal lobectomies was linearly correlated to a decline in naming, with a clinically significant decline occurring once the resection extended 6 cm from the anterior tip of the temporal lobe on the ventral surface. On electrocorticography, the majority of these cortical regions were functionally active following visual processing. These loci coincide with the sites of susceptibility artifacts during echoplanar imaging, which may explain why this region has been previously underappreciated as the locus responsible for postoperative naming deficits. SIGNIFICANCE Taken together, these data highlight the crucial contribution of the ventral temporal cortex in naming and its important role in the pathophysiology of anomia following temporal lobe resections. As such, surgical strategies should attempt to preserve this region to mitigate postoperative language deficits.
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Affiliation(s)
- Kathryn M Snyder
- Vivian L. Smith Department of Neurosurgery, McGovern Medical School at UT Health Houston, Houston, Texas, USA.,Texas Institute for Restorative Neurotechnologies, University of Texas Health Science Center at Houston, Houston, Texas, USA
| | - Kiefer J Forseth
- Vivian L. Smith Department of Neurosurgery, McGovern Medical School at UT Health Houston, Houston, Texas, USA.,Texas Institute for Restorative Neurotechnologies, University of Texas Health Science Center at Houston, Houston, Texas, USA
| | - Cristian Donos
- Vivian L. Smith Department of Neurosurgery, McGovern Medical School at UT Health Houston, Houston, Texas, USA.,Faculty of Physics, University of Bucharest, Bucharest, Romania
| | - Patrick S Rollo
- Vivian L. Smith Department of Neurosurgery, McGovern Medical School at UT Health Houston, Houston, Texas, USA.,Texas Institute for Restorative Neurotechnologies, University of Texas Health Science Center at Houston, Houston, Texas, USA
| | - Simon Fischer-Baum
- Department of Psychological Sciences, Rice University, Houston, Texas, USA
| | - Joshua Breier
- Vivian L. Smith Department of Neurosurgery, McGovern Medical School at UT Health Houston, Houston, Texas, USA.,Memorial Hermann Hospital, Texas Medical Center, Houston, Texas, USA
| | - Nitin Tandon
- Vivian L. Smith Department of Neurosurgery, McGovern Medical School at UT Health Houston, Houston, Texas, USA.,Texas Institute for Restorative Neurotechnologies, University of Texas Health Science Center at Houston, Houston, Texas, USA.,Memorial Hermann Hospital, Texas Medical Center, Houston, Texas, USA
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Anderson EJ, Midgley KJ, Holcomb PJ, Riès SK. Taxonomic and thematic semantic relationships in picture naming as revealed by Laplacian-transformed event-related potentials. Psychophysiology 2022; 59:e14091. [PMID: 35554943 PMCID: PMC9788343 DOI: 10.1111/psyp.14091] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 03/30/2022] [Accepted: 04/20/2022] [Indexed: 12/31/2022]
Abstract
Semantically related concepts co-activate when we speak. Prior research reported both behavioral interference and facilitation due to co-activation during picture naming. Different word relationships may account for some of this discrepancy. Taxonomically related words (e.g., WOLF-DOG) have been associated with semantic interference; thematically related words (e.g., BONE-DOG) have been associated with facilitation. Although these different semantic relationships have been associated with opposite behavioral outcomes, electrophysiological studies have found inconsistent effects on event-related potentials. We conducted a picture-word interference electroencephalography experiment to examine word retrieval dynamics in these different semantic relationships. Importantly, we used traditional monopolar analysis as well as Laplacian transformation allowing us to examine spatially deblurred event-related components. Both analyses revealed greater negativity (150-250 ms) for unrelated than related taxonomic pairs, though more restricted in space for thematic pairs. Critically, Laplacian analyses revealed a larger negative-going component in the 300 to 500 ms time window in taxonomically related versus unrelated pairs which were restricted to a left frontal recording site. In parallel, an opposite effect was found in the same time window but localized to a left parietal site. Finding these opposite effects in the same time window was feasible thanks to the use of the Laplacian transformation and suggests that frontal control processes are concurrently engaged with cascading effects of the spread of activation through semantically related representations.
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Affiliation(s)
- Elizabeth J. Anderson
- Joint Doctoral Program in Language and Communicative DisordersSan Diego State UniversitySan DiegoCaliforniaUSA,Joint Doctoral Program in Language and Communicative DisordersUniversity of California San DiegoLa JollaCaliforniaUSA
| | | | - Phillip J. Holcomb
- Department of PsychologySan Diego State UniversitySan DiegoCaliforniaUSA
| | - Stephanie K. Riès
- School of Speech, Language, and Hearing SciencesSan Diego State UniversitySan DiegoCaliforniaUSA
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Isella V, Rosazza C, Ferri F, Gazzotti M, Impagnatiello V, Mapelli C, Morzenti S, Crivellaro C, Appollonio IM, Ferrarese C. Learning From Mistakes: Cognitive and Metabolic Correlates of Errors on Picture Naming in the Alzheimer’s Disease Spectrum. J Alzheimers Dis 2022; 87:1033-1053. [DOI: 10.3233/jad-220053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Background: Analysis of subtypes of picture naming errors produced by patients with Alzheimer’s disease (AD) have seldom been investigated yet may clarify the cognitive and neural underpinnings of naming in the AD spectrum. Objective: To elucidate the neurocognitive bases of picture naming in AD through a qualitative analysis of errors. Methods: Over 1000 naming errors produced by 70 patients with amnestic, visuospatial, linguistic, or frontal AD were correlated with general cognitive tests and with distribution of hypometabolism on FDG-PET. Results: Principal component analysis identified 1) a Visual processing factor clustering visuospatial tests and unrecognized stimuli, pure visual errors and visual-semantic errors, associated with right parieto-occipital hypometabolism; 2) a Concept-Lemma factor grouping language tests and anomias, circumlocutions, superordinates, and coordinates, correlated with left basal temporal hypometabolism; 3) a Lemma-Phonology factor including the digit span and phonological errors, linked with left temporo-parietal hypometabolism. Regression of brain metabolism on individual errors showed that errors due to impairment of basic and higher-order processing of object visual attributes or of their interaction with semantics, were related with bilateral occipital and left occipito-temporal dysfunction. Omissions and superordinates were linked to degradation of broad and basic concepts in the left basal temporal cortex. Semantic-lexical errors derived from faulty semantically- and phonologically-driven lexical retrieval in the left superior and middle temporal gyri. Generation of nonwords was underpinned by of phonological impairment within the left inferior parietal cortex. Conclusion: Analysis of individual naming errors allowed to outline a comprehensive anatomo-functional model of picture naming in classical and atypical AD.
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Affiliation(s)
- Valeria Isella
- Department of Neurology, S. Gerardo Hospital, Monza, University of Milano - Bicocca, Italy
- NeuroMI, University of Milano - Bicocca, Italy
| | - Cristina Rosazza
- Dipartimento di Studi Umanistici (DISTUM), Università degli Studi di Urbino Carlo Bo, Urbino, Italy
- Neuroradiology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Francesca Ferri
- Department of Neurology, S. Gerardo Hospital, Monza, University of Milano - Bicocca, Italy
- NeuroMI, University of Milano - Bicocca, Italy
| | - Maria Gazzotti
- Department of Neurology, S. Gerardo Hospital, Monza, University of Milano - Bicocca, Italy
| | | | - Cristina Mapelli
- Department of Neurology, S. Gerardo Hospital, Monza, University of Milano - Bicocca, Italy
- NeuroMI, University of Milano - Bicocca, Italy
| | - Sabrina Morzenti
- Medical Physics, S. Gerardo Hospital, Monza, Italy
- NeuroMI, University of Milano - Bicocca, Italy
| | - Cinzia Crivellaro
- Nuclear Medicine, S. Gerardo Hospital, Monza, Italy
- NeuroMI, University of Milano - Bicocca, Italy
| | - Ildebrando M. Appollonio
- Department of Neurology, S. Gerardo Hospital, Monza, University of Milano - Bicocca, Italy
- NeuroMI, University of Milano - Bicocca, Italy
| | - Carlo Ferrarese
- Department of Neurology, S. Gerardo Hospital, Monza, University of Milano - Bicocca, Italy
- NeuroMI, University of Milano - Bicocca, Italy
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Kaestner E, Stasenko A, Ben-Haim S, Shih J, Paul BM, McDonald CR. The importance of basal-temporal white matter to pre- and post-surgical naming ability in temporal lobe epilepsy. Neuroimage Clin 2022; 34:102963. [PMID: 35220106 PMCID: PMC8888987 DOI: 10.1016/j.nicl.2022.102963] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 12/15/2021] [Accepted: 02/07/2022] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Emerging research highlights the importance of basal-temporal cortex, centered on the fusiform gyrus, to both pre-surgical naming ability and post-surgical naming outcomes in temporal lobe epilepsy (TLE). In this study, we investigate whether integrity of the white matter network that interconnects this basal region to the distributed language network affects naming ability and risk for post-surgical naming decline. METHODS Patients with drug-resistant TLE were recruited from two epilepsy centers in a prospective longitudinal study. The pre-surgical dataset included 50 healthy controls, 47 left TLE (L-TLE), and 41 right TLE (R-TLE) patients. All participants completed pre-surgical T1- and diffusion-weighted MRI (dMRI), as well as neuropsychological tests of auditory and visual naming. Nineteen L-TLE and 18 R-TLE patients underwent anterior temporal lobectomy (ATL) and also completed post-surgical neuropsychological testing. Pre-surgical fractional anisotropy (FA) of the white matter directly beneath the fusiform neocortex (i.e., superficial white matter; SWM) and of deep white matter tracts with connections to the basal-temporal cortex [inferior longitudinal fasciculus (ILF) and inferior frontal occipital fasciculus (IFOF)] was calculated. Clinical variables, hippocampal volume, and FA of each white matter tract or region were examined in linear regressions with naming scores, or change in naming scores, as the primary outcomes. RESULTS Pre-surgically, higher FA in the bilateral ILF, bilateral IFOF, and left fusiform SWM was associated with better visual and auditory naming scores (all ps < 0.05 with FDR correction). In L-TLE, higher pre-surgical FA was also associated with less naming decline post-surgically, but results varied across tracts. When including only patients with typical language dominance, only integrity of the right fusiform SWM was associated with less visual naming decline (p = .0018). DISCUSSION Although a broad network of white matter network matter may contribute to naming ability pre-surgically, the reserve capacity of the contralateral (right) fusiform SWM may be important for mitigating visual naming decline following ATL in L-TLE. This shows that the study of the structural network interconnecting the basal-temporal region to the wider language network has implications for understanding both pre- and post-surgical naming in TLE.
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Affiliation(s)
- Erik Kaestner
- Center for Multimodal Imaging and Genetics, University of California, San Diego, CA, USA; Department of Psychiatry, University of California, San Diego, CA, USA
| | - Alena Stasenko
- Center for Multimodal Imaging and Genetics, University of California, San Diego, CA, USA; Department of Psychiatry, University of California, San Diego, CA, USA
| | - Sharona Ben-Haim
- Department of Neurosurgery, University of California, San Diego, CA, USA
| | - Jerry Shih
- Department of Neurosurgery, University of California, San Diego, CA, USA
| | - Brianna M Paul
- Department of Neurology, University of California -San Francisco, San Francisco, CA, USA
| | - Carrie R McDonald
- Center for Multimodal Imaging and Genetics, University of California, San Diego, CA, USA; Department of Psychiatry, University of California, San Diego, CA, USA; San Diego State University, University of California San Diego Joint Doctoral Program in Clinical Psychology, San Diego, CA, USA
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10
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Frazzini V, Cousyn L, Navarro V. Semiology, EEG, and neuroimaging findings in temporal lobe epilepsies. HANDBOOK OF CLINICAL NEUROLOGY 2022; 187:489-518. [PMID: 35964989 DOI: 10.1016/b978-0-12-823493-8.00021-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Temporal lobe epilepsy (TLE) is the most common type of focal epilepsy. First descriptions of TLE date back in time and detailed portraits of epileptic seizures of temporal origin can be found in early medical reports as well as in the works of various artists and dramatists. Depending on the seizure onset zone, several subtypes of TLE have been identified, each one associated with peculiar ictal semiology. TLE can result from multiple etiological causes, ranging from genetic to lesional ones. While the diagnosis of TLE relies on detailed analysis of clinical as well as electroencephalographic (EEG) features, the lesions responsible for seizure generation can be highlighted by multiple brain imaging modalities or, in selected cases, by genetic investigations. TLE is the most common cause of refractory epilepsy and despite the great advances in diagnostic tools, no lesion is found in around one-third of patients. Surgical treatment is a safe and effective option, requiring presurgical investigations to accurately identify the seizure onset zone (SOZ). In selected cases, presurgical investigations need intracerebral investigations (such as stereoelectroencephalography) or dedicated metabolic imaging techniques (interictal PET and ictal SPECT) to correctly identify the brain structures to be removed.
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Affiliation(s)
- Valerio Frazzini
- AP-HP, Department of Neurology and Department of Clinical Neurophysiology, Epilepsy and EEG Unit, Reference Center for Rare Epilepsies, Pitié-Salpêtrière Hospital, Paris, France; Sorbonne Université, Paris Brain Institute, Team "Dynamics of Neuronal Networks and Neuronal Excitability", Paris, France
| | - Louis Cousyn
- AP-HP, Department of Neurology and Department of Clinical Neurophysiology, Epilepsy and EEG Unit, Reference Center for Rare Epilepsies, Pitié-Salpêtrière Hospital, Paris, France; Sorbonne Université, Paris Brain Institute, Team "Dynamics of Neuronal Networks and Neuronal Excitability", Paris, France
| | - Vincent Navarro
- AP-HP, Department of Neurology and Department of Clinical Neurophysiology, Epilepsy and EEG Unit, Reference Center for Rare Epilepsies, Pitié-Salpêtrière Hospital, Paris, France; Sorbonne Université, Paris Brain Institute, Team "Dynamics of Neuronal Networks and Neuronal Excitability", Paris, France.
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11
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Trimmel K, Vos SB, Caciagli L, Xiao F, van Graan LA, Winston GP, Koepp MJ, Thompson PJ, Duncan JS. Decoupling of functional and structural language networks in temporal lobe epilepsy. Epilepsia 2021; 62:2941-2954. [PMID: 34642939 PMCID: PMC8776336 DOI: 10.1111/epi.17098] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 09/25/2021] [Accepted: 09/29/2021] [Indexed: 12/01/2022]
Abstract
Objective To identify functional and structural alterations in language networks of people with temporal lobe epilepsy (TLE), who frequently present with naming and word‐finding difficulties. Methods Fifty‐five patients with unilateral TLE (29 left) and 16 controls were studied with auditory and picture naming functional magnetic resonance imaging (fMRI) tasks. Activation maxima in the left posterobasal temporal lobe were used as seed regions for whole‐brain functional connectivity analyses (psychophysiological interaction). White matter language pathways were investigated using diffusion tensor imaging and neurite orientation dispersion and density imaging metrics extracted along fiber bundles starting from fMRI‐guided seeds. Regression analyses were performed to investigate the correlation of functional connectivity with diffusion MRI metrics. Results In the whole group of patients and controls, weaker functional connectivity from the left posterobasal temporal lobe (1) to the bilateral anterior temporal lobe, precentral gyrus, and lingual gyrus during auditory naming and (2) to the bilateral occipital cortex and right fusiform gyrus during picture naming was associated with decreased neurite orientation dispersion and higher free water fraction of white matter tracts. Compared to controls, TLE patients exhibited fewer structural connections and an impaired coupling of functional and structural metrics. Significance TLE is associated with an impairment and decoupling of functional and structural language networks. White matter damage, as evidenced by diffusion abnormalities, may contribute to impaired functional connectivity and language dysfunction in TLE.
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Affiliation(s)
- Karin Trimmel
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, UK.,Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, UK.,Department of Neurology, Medical University of Vienna, Vienna, Austria
| | - Sjoerd B Vos
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, UK.,Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, UK.,Centre for Medical Image Computing, University College London, London, UK.,Neuroradiological Academic Unit, UCL Queen Square Institute of Neurology, University College London, London, UK
| | - Lorenzo Caciagli
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, UK.,Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, UK
| | - Fenglai Xiao
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, UK.,Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, UK.,Department of Neurology, West China of Sichuan University, Chengdu, China
| | | | - Gavin P Winston
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, UK.,Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, UK.,Division of Neurology, Department of Medicine, Queen's University, Kingston, Canada
| | - Matthias J Koepp
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, UK.,Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, UK
| | - Pamela J Thompson
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, UK.,Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, UK
| | - John S Duncan
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, UK.,Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, UK
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12
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Hauptman M, Blanco-Elorrieta E, Pylkkänen L. Inflection across Categories: Tracking Abstract Morphological Processing in Language Production with MEG. Cereb Cortex 2021; 32:1721-1736. [PMID: 34515304 PMCID: PMC9016284 DOI: 10.1093/cercor/bhab309] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 07/26/2021] [Accepted: 07/27/2021] [Indexed: 11/21/2022] Open
Abstract
Coherent language production requires that speakers adapt words to their grammatical contexts. A fundamental challenge in establishing a functional delineation of this process in the brain is that each linguistic process tends to correlate with numerous others. Our work investigated the neural basis of morphological inflection by measuring magnetoencephalography during the planning of inflected and uninflected utterances that varied across several linguistic dimensions. Results reveal increased activity in the left lateral frontotemporal cortex when inflection is planned, irrespective of phonological specification, syntactic context, or semantic type. Additional findings from univariate and connectivity analyses suggest that the brain distinguishes between different types of inflection. Specifically, planning noun and verb utterances requiring the addition of the suffix -s elicited increased activity in the ventral prefrontal cortex. A broadly distributed effect of syntactic context (verb vs. noun) was also identified. Results from representational similarity analysis indicate that this effect cannot be explained in terms of word meaning. Together, these results 1) offer evidence for a neural representation of abstract inflection that separates from other stimulus properties and 2) challenge theories that emphasize semantic content as a source of verb/noun processing differences.
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Affiliation(s)
- Miriam Hauptman
- Department of Psychology, New York University, New York, NY 10003, USA.,NYUAD Institute, New York University Abu Dhabi, Abu Dhabi, P.O. Box 129188, UAE
| | - Esti Blanco-Elorrieta
- Department of Psychology, New York University, New York, NY 10003, USA.,Department of Psychology, Harvard University, Cambridge, MA 02138, USA
| | - Liina Pylkkänen
- Department of Psychology, New York University, New York, NY 10003, USA.,NYUAD Institute, New York University Abu Dhabi, Abu Dhabi, P.O. Box 129188, UAE.,Department of Linguistics, New York University, New York, NY 10003, USA
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13
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Pérez-Pérez D, Frías-Soria CL, Rocha L. Drug-resistant epilepsy: From multiple hypotheses to an integral explanation using preclinical resources. Epilepsy Behav 2021; 121:106430. [PMID: 31378558 DOI: 10.1016/j.yebeh.2019.07.031] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 06/12/2019] [Accepted: 07/06/2019] [Indexed: 01/07/2023]
Abstract
Drug-resistant epilepsy affects approximately one-third of the patients with epilepsy. The pharmacoresistant condition in epilepsy is mainly explained by six hypotheses. In addition, several experimental models have been used to understand the mechanisms involved in pharmacoresistant epilepsy and to identify novel therapies to control this condition. However, the global prevalence of this disease persists without changes. Several factors can explain this situation. First of all, the pharmacoresistant epilepsy is explained by different and independent hypotheses. Each hypothesis indicates specific mechanisms to explain the drug-resistant condition in epilepsy. However, there are different findings suggesting common mechanisms between the different hypotheses. Other important situation is that the experimental models designed for the screening of drugs with potential anticonvulsant effect do not consider factors such as age, gender, type of epilepsy, and comorbid disorders. The present review focuses on indicating the limitations for each hypothesis and the relationships among them. The relevance to consider central and peripheral phenomena associated with the drug-resistant condition in different types of epilepsy is also indicated. The necessity to establish a global hypothesis that integrates all the phenomena associated with the pharmacoresistant epilepsy is proposed. This article is part of the Special Issue "NEWroscience 2018".
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Affiliation(s)
- Daniel Pérez-Pérez
- PECEM (MD/PhD), Faculty of Medicine, National Autonomous University of Mexico, Mexico City, Mexico
| | | | - Luisa Rocha
- Pharmacobiology Department, Center of Research and Advanced Studies, Mexico City, Mexico.
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14
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Poch C, Toledano R, García-Morales I, Alemán-Gómez Y, Gil-Nagel A, Campo P. Contributions of left and right anterior temporal lobes to semantic cognition: Evidence from patients with small temporopolar lesions. Neuropsychologia 2020; 152:107738. [PMID: 33383038 DOI: 10.1016/j.neuropsychologia.2020.107738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 12/04/2020] [Accepted: 12/24/2020] [Indexed: 11/18/2022]
Abstract
Decades of research have increased the understanding of the contribution of the anterior temporal lobes (ATLs) to semantic cognition. Nonetheless, whether semantic processing of different types of information show a selective relationship with left and right ATLs, or whether semantic processing in the ATLs is independent of the modality of the input is currently unknown. There exists evidence supporting each of these alternatives. A fundamental objection to these findings is that they were obtained from studies with patients with brain damage affecting extensive regions, sometimes bilaterally. In the current study, we assessed a group of 38 temporal lobe epilepsy (TLE) patients with either left or right small epileptogenic lesions with a battery of commonly used semantic tasks that tested verbal and non-verbal semantic processing. We found that left TLE patients exhibited worse performance than controls on the verbal semantic tasks, as expected, but also on the non-verbal semantic task. On the other hand, performance of the right TLE group did not differ from controls on the non-verbal task, but was worse on a semantic fluency task. When performance between patient groups was compared, we found that left TLE not only did worse than right TLE on the naming task, but also on the non-verbal associative memory task. When considered together, current data do not support a strong view of input modality differences between left and right ATLs. Additionally, they provide evidence indicating that the left and right ATLs do not make similar contributions to a singular functional system for semantic representation.
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Affiliation(s)
- Claudia Poch
- Facultad de Lenguas y Educación, Universidad Nebrija, Spain
| | - Rafael Toledano
- Hospital Ruber Internacional, Epilepsy Unit, Neurology Department, Madrid, Spain; University Hospital of Ramón y Cajal, Epilepsy Unit, Neurology Department, Madrid, Spain
| | - Irene García-Morales
- Hospital Ruber Internacional, Epilepsy Unit, Neurology Department, Madrid, Spain; University Hospital of San Carlos, Epilepsy Unit, Neurology Department, Madrid, Spain
| | - Yasser Alemán-Gómez
- Center for Psychiatric Neuroscience, Department of Psychiatry, Centre Hospitalier Universitaire Vaudois (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland; Department of Radiology, Centre Hospitalier Universitaire Vaudois (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland; Medical Image Analysis Laboratory (MIAL), Centre D'Imagerie BioMédicale (CIBM), Lausanne, Switzerland
| | - Antonio Gil-Nagel
- Hospital Ruber Internacional, Epilepsy Unit, Neurology Department, Madrid, Spain
| | - Pablo Campo
- Department of Basic Psychology, Autonoma University of Madrid, Madrid, Spain.
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15
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Trébuchon A, Liégeois-Chauvel C, Gonzalez-Martinez JA, Alario FX. Contributions of electrophysiology for identifying cortical language systems in patients with epilepsy. Epilepsy Behav 2020; 112:107407. [PMID: 33181892 DOI: 10.1016/j.yebeh.2020.107407] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 08/10/2020] [Accepted: 08/10/2020] [Indexed: 11/26/2022]
Abstract
A crucial element of the surgical treatment of medically refractory epilepsy is to delineate cortical areas that must be spared in order to avoid clinically relevant neurological and neuropsychological deficits postoperatively. For each patient, this typically necessitates determining the language lateralization between hemispheres and language localization within hemisphere. Understanding cortical language systems is complicated by two primary challenges: the extent of the neural tissue involved and the substantial variability across individuals, especially in pathological populations. We review the contributions made through the study of electrophysiological activity to address these challenges. These contributions are based on the techniques of magnetoencephalography (MEG), intracerebral recordings, electrical-cortical stimulation (ECS), and the electrovideo analyses of seizures and their semiology. We highlight why no single modality alone is adequate to identify cortical language systems and suggest avenues for improving current practice.
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Affiliation(s)
- Agnès Trébuchon
- Aix-Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France
| | - Catherine Liégeois-Chauvel
- Aix-Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; Department of Neurological Surgery, School of Medicine, University of Pittsburgh (PA), USA
| | | | - F-Xavier Alario
- Department of Neurological Surgery, School of Medicine, University of Pittsburgh (PA), USA; Aix-Marseille Univ, CNRS, LPC, Marseille, France.
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16
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Bartha-Doering L, Kollndorfer K, Schwartz E, Fischmeister FPS, Alexopoulos J, Langs G, Prayer D, Kasprian G, Seidl R. The role of the corpus callosum in language network connectivity in children. Dev Sci 2020; 24:e13031. [PMID: 32790079 PMCID: PMC7988581 DOI: 10.1111/desc.13031] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 05/15/2020] [Accepted: 08/07/2020] [Indexed: 11/30/2022]
Abstract
The specific role of the corpus callosum (CC) in language network organization remains unclear, two contrasting models have been proposed: inhibition of homotopic areas allowing for independent functioning of the hemispheres versus integration of information from both hemispheres. This study aimed to add to this discussion with the first investigation of language network connectivity in combination with CC volume measures. In 38 healthy children aged 6–12, we performed task‐based functional magnetic resonance imaging to measure language network connectivity, used structural magnetic resonance imaging to quantify CC subsection volumes, and administered various language tests to examine language abilities. We found an increase in left intrahemispheric and bilateral language network connectivity and a decrease in right intrahemispheric connectivity associated with larger volumes of the posterior, mid‐posterior, and central subsections of the CC. Consistent with that, larger volumes of the posterior parts of the CC were significantly associated with better verbal fluency and vocabulary, the anterior CC volume was positively correlated with verbal span. Thus, children with larger volumes of CC subsections showed increased interhemispheric language network connectivity and were better in different language domains. This study presents the first evidence that the CC is directly linked to language network connectivity and underlines the excitatory role of the CC in the integration of information from both hemispheres.
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Affiliation(s)
- Lisa Bartha-Doering
- Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria.,Comprehensive Center for Pediatrics, Medical University of Vienna, Vienna, Austria
| | - Kathrin Kollndorfer
- Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria.,Comprehensive Center for Pediatrics, Medical University of Vienna, Vienna, Austria.,Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Ernst Schwartz
- Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | | | - Johanna Alexopoulos
- Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria.,Comprehensive Center for Pediatrics, Medical University of Vienna, Vienna, Austria.,Department of Psychoanalysis and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Georg Langs
- Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Daniela Prayer
- Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Gregor Kasprian
- Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Rainer Seidl
- Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria.,Comprehensive Center for Pediatrics, Medical University of Vienna, Vienna, Austria
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17
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Single-word, sentence, and discourse comprehension in individuals with temporal lobe epilepsy. Epilepsy Behav 2020; 110:107140. [PMID: 32454295 DOI: 10.1016/j.yebeh.2020.107140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 04/21/2020] [Accepted: 04/24/2020] [Indexed: 11/23/2022]
Abstract
The purpose of this study was to systematically investigate language comprehension in individuals with left and right temporal lobe epilepsy (TLE) at different language levels - single word (noun and verb), sentence, and discourse. Neither of the groups with TLE showed difficulties with noun comprehension, whereas verb comprehension performance was significantly lower in individuals with left, but not right TLE as compared to healthy controls. In contrast, sentence and discourse comprehension was overall impaired, irrespective of the lateralization of the epileptogenic focus. Education level and age at seizure onset were also found correlating with language comprehension in our tested cohort. The results, firstly, confirm that the verb comprehension task is more sensitive for assessment of single-word comprehension in individuals with TLE. Secondly, they indicate that language comprehension in left and right TLE is mostly impaired at the sentence and discourse levels, which may be associated with low working memory capacities.
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18
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Fasola A, Alario FX, Tellier M, Giusiano B, Tassinari CA, Bartolomei F, Trébuchon A. A description of verbal and gestural communication during postictal aphasia. Epilepsy Behav 2020; 102:106646. [PMID: 31759317 DOI: 10.1016/j.yebeh.2019.106646] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 09/18/2019] [Accepted: 10/05/2019] [Indexed: 11/25/2022]
Abstract
Patients suffering from drug-resistant temporal lobe epilepsy show substantial language deficits (i.e., anomia) during their seizures and in the postictal period (postictal aphasia). Verbal impairments observed during the postictal period may be studied to help localizing the epileptogenic zone. These explorations have been essentially based on simple tasks focused on speech, thus disregarding the multimodal nature of verbal communication, particularly the fact that, when speakers want to communicate, they often produce gestures of various kinds. Here, we propose an innovative procedure for testing postictal language and communication abilities, including the assessment of co-speech gestures. We provide a preliminary description of the changes induced on communication during postictal aphasia. We studied 21 seizures that induced postictal aphasia from 12 patients with drug-refractory epilepsy, including left temporal and left frontal seizures. The experimental task required patients to memorize a highly detailed picture and, briefly after, to describe what they had seen, thus eliciting a communicative meaningful monologue. This allowed comparing verbal communication in postictal and interictal conditions within the same individuals. Co-speech gestures were coded according to two categories: "Rhythmic" gestures, thought to be produced in support of speech building, and "illustrative" gestures, thought to be produced to complement the speech content. When postictal and interictal conditions were compared, there was decreased speech flow along with an increase of rhythmic gesture production at the expense of illustrative gesture production. The communication patterns did not differ significantly after temporal and frontal seizures, yet they were illustrated separately, owing to the clinical importance of the distinction, along with considerations of interindividual variability. A contrast between rhythmic and illustrative gestures production is congruent with previous literature in which rhythmic gestures have been linked to lexical retrieval processes. If confirmed in further studies, such evidence for a facilitative role of co-speech gestures in language difficulties could be put to use in the context of multimodal language therapies.
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Affiliation(s)
- Alexia Fasola
- Institute of Language, Communication and the Brain (ANR-16- CONV-0002) - ILCB, Aix-Marseille Univ., France.
| | | | - Marion Tellier
- Aix Marseille Univ., CNRS, LPL, Aix-en-Provence, France.
| | - Bernard Giusiano
- Aix Marseille Univ., INSERM, INS, Inst Neurosci Syst, Marseille, France.
| | | | - Fabrice Bartolomei
- Aix Marseille Univ., INSERM, INS, Inst Neurosci Syst, Marseille, France.
| | - Agnès Trébuchon
- Aix Marseille Univ., INSERM, INS, Inst Neurosci Syst, Marseille, France.
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19
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Vigliecca NS, Voos JA. Remembering a name: Neuropsychological validity studies and a computer proposal for detection of anomia. Dement Neuropsychol 2019; 13:450-462. [PMID: 31844500 PMCID: PMC6907700 DOI: 10.1590/1980-57642018dn13-040013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
There are contradictory results or lack of validity studies concerning the naming
function and brain laterality. Although anomia is a frequent symptom of memory
impairment, and the most relevant symptom of aphasia, few studies have been
conducted to evaluate its validity for detecting patients with left-hemisphere
damage (LD), as per the MeSH definition.
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Affiliation(s)
- Nora Silvana Vigliecca
- Servicio de Neurología y Neurocirugía del Hospital Córdoba, Argentina.,Universidad Tecnológica Nacional (UTN), Regional Córdoba; Córdoba, Argentina
| | - Javier Alfredo Voos
- Servicio de Neurología y Neurocirugía del Hospital Córdoba, Argentina.,Universidad Tecnológica Nacional (UTN), Regional Córdoba; Córdoba, Argentina
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20
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Brandstadter R, Fabian M, Leavitt VM, Krieger S, Yeshokumar A, Katz Sand I, Klineova S, Riley CS, Lewis C, Pelle G, Lublin FD, Miller AE, Sumowski JF. Word-finding difficulty is a prevalent disease-related deficit in early multiple sclerosis. Mult Scler 2019; 26:1752-1764. [PMID: 31741430 DOI: 10.1177/1352458519881760] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Persons with multiple sclerosis (MS) commonly report word-finding difficulty clinically, yet this language deficit remains underexplored. OBJECTIVE To investigate the prevalence and nature of word-finding difficulty in persons with early MS on three levels: patient report, cognitive substrates, and neuroimaging. METHODS Two samples of early MS patients (n = 185 and n = 55; ⩽5 years diagnosed) and healthy controls (n = 50) reported frequency/severity of cognitive deficits and underwent objective assessment with tasks of rapid automatized naming (RAN), measuring lexical access speed, memory, word generation, and cognitive efficiency. High-resolution brain magnetic resonance imaging (MRI) derived measurements of regional cortical thickness, global and deep gray matter volume, and T2 lesion volume. Relationships among patient-reported word-finding difficulty, cognitive performance, and neural correlates were examined. RESULTS Word-finding difficulty was the most common cognitive complaint of MS patients and the only complaint reported more by patients than healthy controls. Only RAN performance discriminated MS patients with subjective word-finding deficits from those without subjective complaints and from healthy controls. Thinner left parietal cortical gray matter independently predicted impaired RAN performance, driven primarily by the left precuneus. CONCLUSION Three levels of evidence (patient-report, objective behavior, regional gray matter) support word-finding difficulty as a prevalent, measurable, disease-related deficit in early MS linked to left parietal cortical thinning.
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Affiliation(s)
- Rachel Brandstadter
- The Corinne Goldsmith Dickinson Center for MS, Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Michelle Fabian
- The Corinne Goldsmith Dickinson Center for MS, Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Victoria M Leavitt
- Department of Neurology, Columbia University Irving Medical Center, New York, NY, USA
| | - Stephen Krieger
- The Corinne Goldsmith Dickinson Center for MS, Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Anusha Yeshokumar
- The Corinne Goldsmith Dickinson Center for MS, Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Ilana Katz Sand
- The Corinne Goldsmith Dickinson Center for MS, Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Sylvia Klineova
- The Corinne Goldsmith Dickinson Center for MS, Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Claire S Riley
- Department of Neurology, Columbia University Irving Medical Center, New York, NY, USA
| | - Christina Lewis
- The Corinne Goldsmith Dickinson Center for MS, Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Gabrielle Pelle
- The Corinne Goldsmith Dickinson Center for MS, Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Fred D Lublin
- The Corinne Goldsmith Dickinson Center for MS, Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Aaron E Miller
- The Corinne Goldsmith Dickinson Center for MS, Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - James F Sumowski
- The Corinne Goldsmith Dickinson Center for MS, Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
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21
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Alemán-Gómez Y, Poch C, Toledano R, Jiménez-Huete A, García-Morales I, Gil-Nagel A, Campo P. Morphometric correlates of anomia in patients with small left temporopolar lesions. J Neuropsychol 2019; 14:260-282. [PMID: 31059211 DOI: 10.1111/jnp.12184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 03/06/2019] [Indexed: 10/26/2022]
Abstract
Visual object naming is a complex cognitive process that engages an interconnected network of cortical regions moving from occipitotemporal to anterior-inferior temporal cortices, and extending into the inferior frontal cortex. Naming can fail for diverse reasons, and different stages of the naming multi-step process appear to be reliant upon the integrity of different neuroanatomical locations. While the neural correlates of semantic errors have been extensively studied, the neural basis of omission errors remains relatively unspecified. Although a strong line of evidence supports an association between anterior temporal lobe damage and semantic errors, there are some studies suggesting that the anterior temporal lobe could be also associated with omissions. However, support for this hypothesis comes from studies with patients in whom damage affected extensive brain regions, sometimes bilaterally. Here, we availed of a group of 12 patients with epilepsy associated with a small lesion at the tip of the left temporal pole. Using an unbiased surface-based morphometry methodology, we correlated two morphological features with errors observed during visual naming. Analyses revealed a correlation between omission errors and reduced local gyrification index in three cortical clusters: one in the left anteromedial temporal lobe region (AMTL) and two in the left anterior cingulate cortex (ACC). Our findings support the view that regions in ACC and AMTL are critical structures within a network engaged in word selection from semantics.
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Affiliation(s)
- Yasser Alemán-Gómez
- Center for Psychiatric Neuroscience, Department of Psychiatry, Centre Hospitalier Universitaire Vaudois (CHUV) and University of Lausanne (UNIL), Switzerland.,Department of Radiology, Centre Hospitalier Universitaire Vaudois (CHUV) and University of Lausanne (UNIL), Switzerland.,Medical Image Analysis Laboratory (MIAL), Centre d'Imagerie BioMédicale (CIBM), Lausanne, Switzerland
| | - Claudia Poch
- Department of Basic Psychology, University Complutense of Madrid, Spain.,Instituto Pluridisciplinar, University Complutense of Madrid, Spain.,Facultad de Lenguas y Educación, Universidad Nebrija, Madrid, Spain
| | - Rafael Toledano
- Epilepsy Unit, Neurology Department, Hospital Ruber Internacional, Madrid, Spain.,Epilepsy Unit, Neurology Department, University Hospital of Ramón y Cajal, Madrid, Spain
| | - Adolfo Jiménez-Huete
- Epilepsy Unit, Neurology Department, Hospital Ruber Internacional, Madrid, Spain
| | - Irene García-Morales
- Epilepsy Unit, Neurology Department, Hospital Ruber Internacional, Madrid, Spain.,Epilepsy Unit, Neurology Department, University Hospital of San Carlos, Madrid, Spain
| | - Antonio Gil-Nagel
- Epilepsy Unit, Neurology Department, Hospital Ruber Internacional, Madrid, Spain
| | - Pablo Campo
- Department of Basic Psychology, Autonoma University of Madrid, Spain
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22
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Valech N, Tort-Merino A, Coll-Padrós N, Olives J, León M, Rami L, Molinuevo JL. Executive and Language Subjective Cognitive Decline Complaints Discriminate Preclinical Alzheimer's Disease from Normal Aging. J Alzheimers Dis 2019; 61:689-703. [PMID: 29254090 DOI: 10.3233/jad-170627] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND There is a need to specify the profile of subjective cognitive decline in preclinical Alzheimer's disease (preAD). OBJECTIVES To explore specific items of the Subjective Cognitive Decline Questionnaire (SCD-Q) that discriminate preAD from normal aging. METHODS 68 cognitively normal older adults were classified as controls (n = 52) or preAD (n = 16) according to amyloid-β (Aβ) levels. An exploratory factor analysis and item analysis of the SCD-Q were performed. Informant reports of the SCD-Q were used to corroborate the findings of self-reports. One-year neuropsychological follow-up was available. RESULTS Four SCD-Q factors were extracted: EM-factor (episodic memory), A-factor (attention), O-factor (organization), and L-factor (language). PreAD reported a significantly higher decline in L-factor (F(1) = 6.49; p = 0.014) and A-factor (F(1) = 4.04; p = 0.049) compared to controls, and showed a higher frequency of perceived decline in SCD-Q items related with language and executive tasks (Sig-items.) Significant discriminative powers for Aβ-positivity were found for L-factor (AUC = 0.75; p = 0.003) and A-factor (AUC = 0.74; p = 0.004). Informants in the preAD group confirmed significantly higher scores in L-factor and Sig-items. A significant time×group interaction was found in the Semantic Fluency and Stroop tests, with the preAD group showing a decrease in performance at one-year. CONCLUSIONS Our results suggest that SCD-Q items related with language and executive decline may help in prediction algorithms to detect preAD. Validation in an independent population is needed.
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Affiliation(s)
- Natalia Valech
- Alzheimer's Disease and Other Cognitive Disorders Unit, Neurology Service, Hospital Clinic, Barcelona, Spain
| | - Adrià Tort-Merino
- Alzheimer's Disease and Other Cognitive Disorders Unit, Neurology Service, Hospital Clinic, Barcelona, Spain
| | - Nina Coll-Padrós
- Alzheimer's Disease and Other Cognitive Disorders Unit, Neurology Service, Hospital Clinic, Barcelona, Spain.,Institut d' Investigacions Biomèdiques August pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - Jaume Olives
- Alzheimer's Disease and Other Cognitive Disorders Unit, Neurology Service, Hospital Clinic, Barcelona, Spain
| | - María León
- Alzheimer's Disease and Other Cognitive Disorders Unit, Neurology Service, Hospital Clinic, Barcelona, Spain
| | - Lorena Rami
- Alzheimer's Disease and Other Cognitive Disorders Unit, Neurology Service, Hospital Clinic, Barcelona, Spain.,Institut d' Investigacions Biomèdiques August pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - José Luis Molinuevo
- Alzheimer's Disease and Other Cognitive Disorders Unit, Neurology Service, Hospital Clinic, Barcelona, Spain.,Institut d' Investigacions Biomèdiques August pi i Sunyer (IDIBAPS), Barcelona, Spain.,Barcelona Beta Brain Research Center, Pasqual Maragall Foundation, Barcelona, Spain
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23
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Kehyayan V, Hirdes JP. Care Needs and Health Care Burden of Persons With Epilepsy Receiving Home Care Services. HOME HEALTH CARE MANAGEMENT AND PRACTICE 2018. [DOI: 10.1177/1084822318806291] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The purpose of this study was to describe the characteristics of persons with epilepsy (PWE) receiving home care services. A cross-sectional study was conducted comparing the characteristics of PWE with those without epilepsy (comparison group). PWE were more likely to have mental health issues and functional, mobility, and cognitive impairments; to receive a variety of psychotropic medications; to experience psychosocial issues such as isolation and conflicts in their relationships; to have caregivers experiencing psychological distress; and to be economically disadvantaged necessitating making economic trade-offs in their care. Epilepsy is associated with caregiver distress and has an impact on health resource utilization. Future studies are needed to identify strategies to improve the quality of care and life of PWE.
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24
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Trimmel K, van Graan AL, Caciagli L, Haag A, Koepp MJ, Thompson PJ, Duncan JS. Left temporal lobe language network connectivity in temporal lobe epilepsy. Brain 2018; 141:2406-2418. [DOI: 10.1093/brain/awy164] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 04/24/2018] [Indexed: 11/13/2022] Open
Affiliation(s)
- Karin Trimmel
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, SL9 0LR, UK
- Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, WC1N 3BG, UK
- Department of Neurology, Medical University of Vienna, 1090-Vienna, Austria
| | - Andre L van Graan
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, SL9 0LR, UK
- Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, WC1N 3BG, UK
| | - Lorenzo Caciagli
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, SL9 0LR, UK
- Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, WC1N 3BG, UK
| | - Anja Haag
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, SL9 0LR, UK
- Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, WC1N 3BG, UK
| | - Matthias J Koepp
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, SL9 0LR, UK
- Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, WC1N 3BG, UK
| | - Pamela J Thompson
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, SL9 0LR, UK
- Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, WC1N 3BG, UK
| | - John S Duncan
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St Peter, SL9 0LR, UK
- Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London, WC1N 3BG, UK
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25
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Sedighi A, Ulman SM, Nussbaum MA. Information presentation through a head-worn display ("smart glasses") has a smaller influence on the temporal structure of gait variability during dual-task gait compared to handheld displays (paper-based system and smartphone). PLoS One 2018; 13:e0195106. [PMID: 29630614 PMCID: PMC5891005 DOI: 10.1371/journal.pone.0195106] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 03/17/2018] [Indexed: 11/24/2022] Open
Abstract
The need to complete multiple tasks concurrently is a common occurrence both daily life and in occupational activities, which can often include simultaneous cognitive and physical demands. As one example, there is increasing availability of head-worn display technologies that can be employed when a user is mobile (e.g., while walking). This new method of information presentation may, however, introduce risks of adverse outcomes such as a decrement to gait performance. The goal of this study was thus to quantify the effects of a head-worn display (i.e., smart glasses) on motor variability during gait and to compare these effects with those of other common information displays (i.e., smartphone and paper-based system). Twenty participants completed four walking conditions, as a single task and in three dual-task conditions (three information displays). In the dual-task conditions, the information display was used to present several cognitive tasks. Three different measures were used to quantify variability in gait parameters for each walking condition (using the cycle-to-cycle standard deviation, sample entropy, and the “goal-equivalent manifold” approach). Our results indicated that participants used less adaptable gait strategies in dual-task walking using the paper-based system and smartphone conditions compared with single-task walking. Gait performance, however, was less affected during dual-task walking with the smart glasses. We conclude that the risk of an adverse gait event (e.g., a fall) in head-down walking conditions (i.e., the paper-based system and smartphone conditions) were higher than in single-task walking, and that head-worn displays might help reduce the risk of such events during dual-task gait conditions.
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Affiliation(s)
- Alireza Sedighi
- Department of Industrial and Systems Engineering, Virginia Tech, Blacksburg, Virginia, United States of America
| | - Sophia M. Ulman
- Department of Industrial and Systems Engineering, Virginia Tech, Blacksburg, Virginia, United States of America
| | - Maury A. Nussbaum
- Department of Industrial and Systems Engineering, Virginia Tech, Blacksburg, Virginia, United States of America
- School of Biomedical Engineering and Sciences, Virginia Tech, Blacksburg, Virginia, United States of America
- * E-mail:
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26
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Dutta M, Murray L, Miller W, Groves D. Effects of Epilepsy on Language Functions: Scoping Review and Data Mining Findings. AMERICAN JOURNAL OF SPEECH-LANGUAGE PATHOLOGY 2018; 27:350-378. [PMID: 29497749 DOI: 10.1044/2017_ajslp-16-0195] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Accepted: 08/29/2017] [Indexed: 06/08/2023]
Abstract
PURPOSE This study involved a scoping review to identify possible gaps in the empirical description of language functioning in epilepsy in adults. With access to social network data, data mining was used to determine if individuals with epilepsy are expressing language-related concerns. METHOD For the scoping review, scientific databases were explored to identify pertinent articles. Findings regarding the nature of epilepsy etiologies, patient characteristics, tested language modalities, and language measures were compiled. Data mining focused on social network databases to obtain a set of relevant language-related posts. RESULTS The search yielded 66 articles. Epilepsy etiologies except temporal lobe epilepsy and older adults were underrepresented. Most studies utilized aphasia tests and primarily assessed single-word productions; few studies included healthy control groups. Data mining revealed several posts regarding epilepsy-related language problems, including word retrieval, reading, writing, verbal memory difficulties, and negative effects of epilepsy treatment on language. CONCLUSION Our findings underscore the need for future specification of the integrity of language in epilepsy, particularly with respect to discourse and high-level language abilities. Increased awareness of epilepsy-related language issues and understanding the patients' perspectives about their language concerns will allow researchers and speech-language pathologists to utilize appropriate assessments and improve quality of care.
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Affiliation(s)
- Manaswita Dutta
- Department of Speech and Hearing Sciences, Indiana University, Bloomington
| | - Laura Murray
- School of Communication Sciences and Disorders, Western University, London, Ontario, Canada
| | - Wendy Miller
- School of Nursing, Indiana University, Bloomington
| | - Doyle Groves
- School of Nursing, Indiana University, Bloomington
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27
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Hope TMH, Price CJ. Why the left posterior inferior temporal lobe is needed for word finding. Brain 2018; 139:2823-2826. [PMID: 29106486 DOI: 10.1093/brain/aww240] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Thomas M H Hope
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University college London, UK
| | - Cathy J Price
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University college London, UK
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28
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Trebuchon A, Lambert I, Guisiano B, McGonigal A, Perot C, Bonini F, Carron R, Liegeois-Chauvel C, Chauvel P, Bartolomei F. The different patterns of seizure-induced aphasia in temporal lobe epilepsies. Epilepsy Behav 2018; 78:256-264. [PMID: 29128469 DOI: 10.1016/j.yebeh.2017.08.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 08/05/2017] [Accepted: 08/14/2017] [Indexed: 10/18/2022]
Abstract
OBJECTIVES Ictal language disturbances may occur in dominant hemisphere temporal lobe epilepsy (TLE), but little is known about the precise anatomoelectroclinical correlations. This study investigated the different facets of ictal aphasia in intracerebrally recorded TLE. METHODS Video-stereoelectroencephalography (SEEG) recordings of 37 seizures in 17 right-handed patients with drug-resistant TLE were analyzed; SEEG electroclinical correlations between language disturbance and involvement of temporal lobe structures were assessed. In the clinical analysis, we separated speech disturbance from loss of consciousness. RESULTS According to the region involved, different patterns of ictal aphasia in TLE were identified. Impaired speech comprehension was associated with posterior lateral involvement, anomia and reduced verbal fluency with anterior mediobasal structures, and jargonaphasia with basal temporal involvement. The language production deficits, such as anomia and low fluency, cannot be simply explained by an involvement of Broca's area, since this region was not affected by seizure discharge. SIGNIFICANCE Assessment of language function in the early ictal state can be successfully performed and provides valuable information on seizure localization within the temporal lobe as well as potentially useful information for guiding surgery.
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Affiliation(s)
- Agnès Trebuchon
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Hôpital de la Timone, Service de Neurophysiologie Clinique, Marseille, France.
| | - Isabelle Lambert
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Hôpital de la Timone, Service de Neurophysiologie Clinique, Marseille, France
| | - Bernard Guisiano
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Hôpital de la Timone, Service de Neurophysiologie Clinique, Marseille, France
| | - Aileen McGonigal
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Hôpital de la Timone, Service de Neurophysiologie Clinique, Marseille, France
| | - Charline Perot
- APHM, Hôpital de la Timone, Service de Neurophysiologie Clinique, Marseille, France
| | - Francesca Bonini
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Hôpital de la Timone, Service de Neurophysiologie Clinique, Marseille, France
| | - Romain Carron
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Hôpital de la Timone, Service de Neurophysiologie Clinique, Marseille, France
| | | | - Patrick Chauvel
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Hôpital de la Timone, Service de Neurophysiologie Clinique, Marseille, France
| | - Fabrice Bartolomei
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Hôpital de la Timone, Service de Neurophysiologie Clinique, Marseille, France
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29
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Verger A, Lagarde S, Maillard L, Bartolomei F, Guedj E. Brain molecular imaging in pharmacoresistant focal epilepsy: Current practice and perspectives. Rev Neurol (Paris) 2018; 174:16-27. [DOI: 10.1016/j.neurol.2017.05.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Accepted: 05/11/2017] [Indexed: 10/19/2022]
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30
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Bédos Ulvin L, Jonas J, Brissart H, Colnat-Coulbois S, Thiriaux A, Vignal JP, Maillard L. Intracerebral stimulation of left and right ventral temporal cortex during object naming. BRAIN AND LANGUAGE 2017; 175:71-76. [PMID: 29024845 DOI: 10.1016/j.bandl.2017.09.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Revised: 09/06/2017] [Accepted: 09/18/2017] [Indexed: 06/07/2023]
Abstract
While object naming is traditionally considered asa left hemisphere function, neuroimaging studies have reported activations related to naming in the ventral temporal cortex (VTC) bilaterally. Our aim was to use intracerebral electrical stimulation to specifically compare left and right VTC in naming. In twenty-three epileptic patients tested for visual object naming during stimulation, the proportion of naming impairments was significantly higher in the left than in the right VTC (31.3% vs 13.6%). The highest proportions of positive naming sites were found in the left fusiform gyrus and occipito-temporal sulcus (47.5% and 31.8%). For 17 positive left naming sites, an additional semantic picture matching was carried out, always successfully performed. Our results showed the enhanced role of the left compared to the right VTC in naming and suggest that it may be involved in lexical retrieval rather than in semantic processing.
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Affiliation(s)
- Line Bédos Ulvin
- Service de Neurologie, Centre Hospitalier Universitaire de Reims, Reims, France.
| | - Jacques Jonas
- Service de Neurologie, Centre Hospitalier Universitaire de Nancy, Nancy, France; CRAN, UMR 7039, CNRS et Université de Lorraine, Nancy, France.
| | - Hélène Brissart
- Service de Neurologie, Centre Hospitalier Universitaire de Nancy, Nancy, France.
| | | | - Anne Thiriaux
- Service de Neurologie, Centre Hospitalier Universitaire de Reims, Reims, France.
| | - Jean-Pierre Vignal
- Service de Neurologie, Centre Hospitalier Universitaire de Nancy, Nancy, France; CRAN, UMR 7039, CNRS et Université de Lorraine, Nancy, France.
| | - Louis Maillard
- Service de Neurologie, Centre Hospitalier Universitaire de Nancy, Nancy, France; CRAN, UMR 7039, CNRS et Université de Lorraine, Nancy, France.
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31
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Yurchenko A, Golovteev A, Kopachev D, Dragoy O. Comprehension and production of nouns and verbs in temporal lobe epilepsy. Epilepsy Behav 2017; 75:127-133. [PMID: 28858722 DOI: 10.1016/j.yebeh.2017.07.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 06/07/2017] [Accepted: 07/05/2017] [Indexed: 11/24/2022]
Abstract
Previous research on linguistic performance at the single-word level in patients with temporal lobe epilepsy (TLE) has mostly been limited to the comprehension and production of nouns, and findings have been inconsistent. Results are likewise limited and controversial regarding the lateralization of the epileptogenic focus. The present study investigates comprehension and production of nouns and verbs in patients with left and right TLE (12 in each group). We designed a comprehension (word-picture matching) test and a production (naming) test, matched on a range of psycholinguistic parameters for the two word classes. The results showed impaired verb comprehension in patients with left TLE and impaired noun and verb production in both groups of patients compared to the control group. Patients with left and right TLE differed significantly on verb comprehension and noun production, whereas verb production was equally impaired in the two groups of patients. These findings suggest difficulties with single-word processing in patients with both left and right TLE, which are more prominent for verbs than for nouns in patients with left TLE. The verb production (action naming) test turned out to be the most effective tool for assessing linguistic difficulties at the single-word level in patients with TLE.
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Affiliation(s)
- Anna Yurchenko
- National Research University Higher School of Economics, Moscow, Russia.
| | | | | | - Olga Dragoy
- National Research University Higher School of Economics, Moscow, Russia; Moscow Research Institute of Psychiatry, Moscow, Russia
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32
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Lomlomdjian C, Múnera CP, Low DM, Terpiluk V, Solís P, Abusamra V, Kochen S. The right hemisphere's contribution to discourse processing: A study in temporal lobe epilepsy. BRAIN AND LANGUAGE 2017; 171:31-41. [PMID: 28478355 DOI: 10.1016/j.bandl.2017.04.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 01/31/2017] [Accepted: 04/02/2017] [Indexed: 06/07/2023]
Abstract
OBJECTIVE Discourse skills - in which the right hemisphere has an important role - enables verbal communication by selecting contextually relevant information and integrating it coherently to infer the correct meaning. However, language research in epilepsy has focused on single word analysis related mainly to left hemisphere processing. The purpose of this study was to investigate discourse abilities in patients with right lateralized medial temporal lobe epilepsy (RTLE) by comparing their performance to that of patients with left temporal lobe epilepsy (LTLE). METHODS 74 pharmacoresistant temporal lobe epilepsy (TLE) patients were evaluated: 34 with RTLE and 40 with LTLE. Subjects underwent a battery of tests that measure comprehension and production of conversational and narrative discourse. Disease related variables and general neuropsychological data were evaluated. RESULTS The RTLE group presented deficits in interictal conversational and narrative discourse, with a disintegrated speech, lack of categorization and misinterpretation of social meaning. LTLE group, on the other hand, showed a tendency to lower performance in logical-temporal sequencing. SIGNIFICANCE RTLE patients showed discourse deficits which have been described in right hemisphere damaged patients due to other etiologies. Medial and anterior temporal lobe structures appear to link semantic, world knowledge, and social cognition associated areas to construct a contextually related coherent meaning.
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Affiliation(s)
- Carolina Lomlomdjian
- Epilepsy Center, Ramos Mejía Hospital, Buenos Aires, Argentina; Center for Clinical and Experimental Neuroscience: Epilepsy, Cognition and Behavior, Cell Biology and Neuroscience Institute (IBCN), School of Medicine, UBA - CONICET, Buenos Aires, Argentina.
| | - Claudia P Múnera
- Epilepsy Center, Ramos Mejía Hospital, Buenos Aires, Argentina; Center for Clinical and Experimental Neuroscience: Epilepsy, Cognition and Behavior, Cell Biology and Neuroscience Institute (IBCN), School of Medicine, UBA - CONICET, Buenos Aires, Argentina
| | - Daniel M Low
- Epilepsy Center, Ramos Mejía Hospital, Buenos Aires, Argentina; Center for Clinical and Experimental Neuroscience: Epilepsy, Cognition and Behavior, Cell Biology and Neuroscience Institute (IBCN), School of Medicine, UBA - CONICET, Buenos Aires, Argentina
| | - Verónica Terpiluk
- Epilepsy Center, Ramos Mejía Hospital, Buenos Aires, Argentina; Center for Clinical and Experimental Neuroscience: Epilepsy, Cognition and Behavior, Cell Biology and Neuroscience Institute (IBCN), School of Medicine, UBA - CONICET, Buenos Aires, Argentina
| | - Patricia Solís
- Epilepsy Center, Ramos Mejía Hospital, Buenos Aires, Argentina; Center for Clinical and Experimental Neuroscience: Epilepsy, Cognition and Behavior, Cell Biology and Neuroscience Institute (IBCN), School of Medicine, UBA - CONICET, Buenos Aires, Argentina; National Neuroscience and Neurosurgery Center, El Cruce Dr. Néstor Kirchner Hospital, Florencio Varela, Buenos Aires, Argentina
| | - Valeria Abusamra
- Neuropsychology Unit, Eva Perón Hospital, San Martín, Argentina; School of Philosophy and Letters, UBA, Buenos Aires, Argentina
| | - Silvia Kochen
- Epilepsy Center, Ramos Mejía Hospital, Buenos Aires, Argentina; Center for Clinical and Experimental Neuroscience: Epilepsy, Cognition and Behavior, Cell Biology and Neuroscience Institute (IBCN), School of Medicine, UBA - CONICET, Buenos Aires, Argentina; National Neuroscience and Neurosurgery Center, El Cruce Dr. Néstor Kirchner Hospital, Florencio Varela, Buenos Aires, Argentina
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Geraldi CDV, Escorsi-Rosset S, Thompson P, Silva ACG, Sakamoto AC. Potential role of a cognitive rehabilitation program following left temporal lobe epilepsy surgery. ARQUIVOS DE NEURO-PSIQUIATRIA 2017; 75:359-365. [DOI: 10.1590/0004-282x20170050] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Accepted: 02/14/2017] [Indexed: 11/22/2022]
Abstract
ABSTRACT Research into memory and epilepsy has focused on measuring problems and exploring causes with limited attention directed at the role of neuropsychological rehabilitation in alleviating post-operative memory difficulties. Objectives To assess the effects of a memory rehabilitation program in patients with left temporal lobe epilepsy following surgery. Methods Twenty-four patients agreed to participate and 18 completed the study; nine received memory rehabilitation while nine had no input and were designated as controls. Verbal learning efficiency, naming abilities, memory subjective ratings, ecological activity measures and a language fMRI paradigm were used as outcome measures. Results Improved verbal learning and naming test performance, increase in memory strategy use and improved self-perception were observed following the rehabilitation. Changes in fMRI activation patterns were seen in the rehabilitation group over the long term. Conclusion The findings support the potential role of a cognitive rehabilitation program following left temporal lobe surgery.
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Affiliation(s)
| | | | - Pamela Thompson
- UCL Institute of Neurology, UK; Epilepsy Society Research Centre, UK
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34
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Spatiotemporal dynamics of word retrieval in speech production revealed by cortical high-frequency band activity. Proc Natl Acad Sci U S A 2017; 114:E4530-E4538. [PMID: 28533406 DOI: 10.1073/pnas.1620669114] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Word retrieval is core to language production and relies on complementary processes: the rapid activation of lexical and conceptual representations and word selection, which chooses the correct word among semantically related competitors. Lexical and conceptual activation is measured by semantic priming. In contrast, word selection is indexed by semantic interference and is hampered in semantically homogeneous (HOM) contexts. We examined the spatiotemporal dynamics of these complementary processes in a picture naming task with blocks of semantically heterogeneous (HET) or HOM stimuli. We used electrocorticography data obtained from frontal and temporal cortices, permitting detailed spatiotemporal analysis of word retrieval processes. A semantic interference effect was observed with naming latencies longer in HOM versus HET blocks. Cortical response strength as indexed by high-frequency band (HFB) activity (70-150 Hz) amplitude revealed effects linked to lexical-semantic activation and word selection observed in widespread regions of the cortical mantle. Depending on the subsecond timing and cortical region, HFB indexed semantic interference (i.e., more activity in HOM than HET blocks) or semantic priming effects (i.e., more activity in HET than HOM blocks). These effects overlapped in time and space in the left posterior inferior temporal gyrus and the left prefrontal cortex. The data do not support a modular view of word retrieval in speech production but rather support substantial overlap of lexical-semantic activation and word selection mechanisms in the brain.
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Gonzálvez GG, Trimmel K, Haag A, van Graan LA, Koepp MJ, Thompson PJ, Duncan JS. Activations in temporal areas using visual and auditory naming stimuli: A language fMRI study in temporal lobe epilepsy. Epilepsy Res 2016; 128:102-112. [PMID: 27833066 DOI: 10.1016/j.eplepsyres.2016.10.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 10/05/2016] [Accepted: 10/24/2016] [Indexed: 10/20/2022]
Abstract
OBJECTIVE Verbal fluency functional MRI (fMRI) is used for predicting language deficits after anterior temporal lobe resection (ATLR) for temporal lobe epilepsy (TLE), but primarily engages frontal lobe areas. In this observational study we investigated fMRI paradigms using visual and auditory stimuli, which predominately involve language areas resected during ATLR. METHODS Twenty-three controls and 33 patients (20 left (LTLE), 13 right (RTLE)) were assessed using three fMRI paradigms: verbal fluency, auditory naming with a contrast of auditory reversed speech; picture naming with a contrast of scrambled pictures and blurred faces. RESULTS Group analysis showed bilateral temporal activations for auditory naming and picture naming. Correcting for auditory and visual input (by subtracting activations resulting from auditory reversed speech and blurred pictures/scrambled faces respectively) resulted in left-lateralised activations for patients and controls, which was more pronounced for LTLE compared to RTLE patients. Individual subject activations at a threshold of T>2.5, extent >10 voxels, showed that verbal fluency activated predominantly the left inferior frontal gyrus (IFG) in 90% of LTLE, 92% of RTLE, and 65% of controls, compared to right IFG activations in only 15% of LTLE and RTLE and 26% of controls. Middle temporal (MTG) or superior temporal gyrus (STG) activations were seen on the left in 30% of LTLE, 23% of RTLE, and 52% of controls, and on the right in 15% of LTLE, 15% of RTLE, and 35% of controls. Auditory naming activated temporal areas more frequently than did verbal fluency (LTLE: 93%/73%; RTLE: 92%/58%; controls: 82%/70% (left/right)). Controlling for auditory input resulted in predominantly left-sided temporal activations. Picture naming resulted in temporal lobe activations less frequently than did auditory naming (LTLE 65%/55%; RTLE 53%/46%; controls 52%/35% (left/right)). Controlling for visual input had left-lateralising effects. CONCLUSION Auditory and picture naming activated temporal lobe structures, which are resected during ATLR, more frequently than did verbal fluency. Controlling for auditory and visual input resulted in more left-lateralised activations. We hypothesise that these paradigms may be more predictive of postoperative language decline than verbal fluency fMRI.
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Affiliation(s)
- Gloria G Gonzálvez
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St. Peter, SL9 0LR, United Kingdom; Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London WC1N 3BG, United Kingdom
| | - Karin Trimmel
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St. Peter, SL9 0LR, United Kingdom; Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London WC1N 3BG, United Kingdom.
| | - Anja Haag
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St. Peter, SL9 0LR, United Kingdom; Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London WC1N 3BG, United Kingdom
| | - Louis A van Graan
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St. Peter, SL9 0LR, United Kingdom; Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London WC1N 3BG, United Kingdom
| | - Matthias J Koepp
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St. Peter, SL9 0LR, United Kingdom; Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London WC1N 3BG, United Kingdom
| | - Pamela J Thompson
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St. Peter, SL9 0LR, United Kingdom; Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London WC1N 3BG, United Kingdom
| | - John S Duncan
- Epilepsy Society MRI Unit, Epilepsy Society, Chalfont St. Peter, SL9 0LR, United Kingdom; Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, Queen Square, London WC1N 3BG, United Kingdom
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Llorens A, Dubarry AS, Trébuchon A, Chauvel P, Alario FX, Liégeois-Chauvel C. Contextual modulation of hippocampal activity during picture naming. BRAIN AND LANGUAGE 2016; 159:92-101. [PMID: 27380274 DOI: 10.1016/j.bandl.2016.05.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 05/17/2016] [Accepted: 05/24/2016] [Indexed: 06/06/2023]
Abstract
Picture naming is a standard task used to probe language processes in healthy and impaired speakers. It recruits a broad neural network of language related areas, among which the hippocampus is rarely included. However, the hippocampus could play a role during picture naming, subtending, for example, implicit learning of the links between pictured objects and their names. To test this hypothesis, we recorded hippocampal activity during plain picture naming, without memorization requirement; we further assessed whether this activity was modulated by contextual factors such as repetition priming and semantic interference. Local field potentials recorded from intracerebral electrodes implanted in the healthy hippocampi of epileptic patients revealed a specific and reliable pattern of activity, markedly modulated by repetition priming and semantic context. These results indicate that the hippocampus is recruited during picture naming, presumably in relation to implicit learning, with contextual factors promoting differential hippocampal processes, possibly subtended by different sub-circuitries.
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Affiliation(s)
- A Llorens
- Aix Marseille Univ, Inserm, Institut des Neurosciences des Systemes, Marseille, France; Aix Marseille Univ, CNRS, UMR7290, LPC, Marseille, France
| | - A-S Dubarry
- Aix Marseille Univ, Inserm, Institut des Neurosciences des Systemes, Marseille, France; Aix Marseille Univ, CNRS, UMR7290, LPC, Marseille, France
| | - A Trébuchon
- Aix Marseille Univ, Inserm, Institut des Neurosciences des Systemes, Marseille, France; AP-HM, Neurophysiologie Clinique, Marseille, France
| | - P Chauvel
- Aix Marseille Univ, Inserm, Institut des Neurosciences des Systemes, Marseille, France; AP-HM, Neurophysiologie Clinique, Marseille, France
| | - F-X Alario
- Aix Marseille Univ, CNRS, UMR7290, LPC, Marseille, France
| | - C Liégeois-Chauvel
- Aix Marseille Univ, Inserm, Institut des Neurosciences des Systemes, Marseille, France.
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Takaya S, Liu H, Greve DN, Tanaka N, Leveroni C, Cole AJ, Stufflebeam SM. Altered anterior-posterior connectivity through the arcuate fasciculus in temporal lobe epilepsy. Hum Brain Mapp 2016; 37:4425-4438. [PMID: 27452151 DOI: 10.1002/hbm.23319] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 07/04/2016] [Accepted: 07/07/2016] [Indexed: 11/09/2022] Open
Abstract
How the interactions between cortices through a specific white matter pathway change during cognitive processing in patients with epilepsy remains unclear. Here, we used surface-based structural connectivity analysis to examine the change in structural connectivity with Broca's area/the right Broca's homologue in the lateral temporal and inferior parietal cortices through the arcuate fasciculus (AF) in 17 patients with left temporal lobe epilepsy (TLE) compared with 17 healthy controls. Then, we investigated its functional relevance to the changes in task-related responses and task-modulated functional connectivity with Broca's area/the right Broca's homologue during a semantic classification task of a single word. The structural connectivity through the AF pathway and task-modulated functional connectivity with Broca's area decreased in the left midtemporal cortex. Furthermore, task-related response decreased in the left mid temporal cortex that overlapped with the region showing a decrease in the structural connectivity. In contrast, the region showing an increase in the structural connectivity through the AF overlapped with the regions showing an increase in task-modulated functional connectivity in the left inferior parietal cortex. These structural and functional changes in the overlapping regions were correlated. The results suggest that the change in the structural connectivity through the left frontal-temporal AF pathway underlies the altered functional networks between the frontal and temporal cortices during the language-related processing in patients with left TLE. The left frontal-parietal AF pathway might be employed to connect anterior and posterior brain regions during language processing and compensate for the compromised left frontal-temporal AF pathway. Hum Brain Mapp 37:4425-4438, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Shigetoshi Takaya
- MGH/HST Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts.,Harvard Medical School, Boston, Massachusetts
| | - Hesheng Liu
- MGH/HST Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts.,Harvard Medical School, Boston, Massachusetts
| | - Douglas N Greve
- MGH/HST Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts.,Harvard Medical School, Boston, Massachusetts
| | - Naoaki Tanaka
- MGH/HST Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts.,Harvard Medical School, Boston, Massachusetts
| | - Catherine Leveroni
- Harvard Medical School, Boston, Massachusetts.,Department of Psychiatry, Massachusetts General Hospital, Boston, Massachusetts
| | - Andrew J Cole
- Harvard Medical School, Boston, Massachusetts.,Department of Neurology, Massachusetts General Hospital, Boston, Massachusetts
| | - Steven M Stufflebeam
- MGH/HST Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts.,Harvard Medical School, Boston, Massachusetts
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Spatio-temporal Dynamics of Referential and Inferential Naming: Different Brain and Cognitive Operations to Lexical Selection. Brain Topogr 2016; 30:182-197. [PMID: 27334987 DOI: 10.1007/s10548-016-0504-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 06/15/2016] [Indexed: 02/03/2023]
Abstract
Picture naming tasks are largely used to elicit the production of specific words and sentences in psycholinguistic and neuroimaging research. However, the generation of lexical concepts from a visual input is clearly not the exclusive way speech production is triggered. In inferential speech encoding, the concept is not provided from a visual input, but is elaborated though semantic and/or episodic associations. It is therefore likely that the cognitive operations leading to lexical selection and word encoding are different in inferential and referential expressive language. In particular, in picture naming lexical selection might ensue from a simple association between a perceptual visual representation and a word with minimal semantic processes, whereas richer semantic associations are involved in lexical retrieval in inferential situations. Here we address this hypothesis by analyzing ERP correlates during word production in a referential and an inferential task. The participants produced the same words elicited from pictures or from short written definitions. The two tasks displayed similar electrophysiological patterns only in the time-period preceding the verbal response. In the stimulus-locked ERPs waveform amplitudes and periods of stable global electrophysiological patterns differed across tasks after the P100 component and until 400-500 ms, suggesting the involvement of different, task-specific neural networks. Based on the analysis of the time-windows affected by specific semantic and lexical variables in each task, we conclude that lexical selection is underpinned by a different set of conceptual and brain processes, with semantic processes clearly preceding word retrieval in naming from definition whereas the semantic information is enriched in parallel with word retrieval in picture naming.
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Riès SK, Dronkers NF, Knight RT. Choosing words: left hemisphere, right hemisphere, or both? Perspective on the lateralization of word retrieval. Ann N Y Acad Sci 2016; 1369:111-31. [PMID: 26766393 DOI: 10.1111/nyas.12993] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Language is considered to be one of the most lateralized human brain functions. Left hemisphere dominance for language has been consistently confirmed in clinical and experimental settings and constitutes one of the main axioms of neurology and neuroscience. However, functional neuroimaging studies are finding that the right hemisphere also plays a role in diverse language functions. Critically, the right hemisphere may also compensate for the loss or degradation of language functions following extensive stroke-induced damage to the left hemisphere. Here, we review studies that focus on our ability to choose words as we speak. Although fluidly performed in individuals with intact language, this process is routinely compromised in aphasic patients. We suggest that parceling word retrieval into its subprocesses-lexical activation and lexical selection-and examining which of these can be compensated for after left hemisphere stroke can advance the understanding of the lateralization of word retrieval in speech production. In particular, the domain-general nature of the brain regions associated with each process may be a helpful indicator of the right hemisphere's propensity for compensation.
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Affiliation(s)
- Stéphanie K Riès
- Department of Psychology and Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, California.,Center for Aphasia and Related Disorders, Veterans Affairs Northern California Health Care System, Martinez, California
| | - Nina F Dronkers
- Center for Aphasia and Related Disorders, Veterans Affairs Northern California Health Care System, Martinez, California.,Department of Neurology, University of California, Davis, Davis, California.,Neurolinguistics Laboratory, National Research University Higher School of Economics, Moscow, Russian Federation
| | - Robert T Knight
- Department of Psychology and Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, California
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40
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Berberian AP, Hopker C, Mazzarotto I, Cunha J, Guarinello AC, Massi G, Crippa A. Aspects of Oral Language, Speech, and Written Language in Subjects with Temporal Lobe Epilepsy of Difficult Control. Int Arch Otorhinolaryngol 2015; 19:302-8. [PMID: 26491475 PMCID: PMC4593911 DOI: 10.1055/s-0035-1547524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Accepted: 01/26/2015] [Indexed: 11/16/2022] Open
Abstract
Introduction About 50 million people have epilepsy and 30% of them have epilepsy that does not respond to properly conducted drug treatment. Objective Verify the incidence of language disorders in oral language, speech, and written language of subjects with difficult to control temporal lobe epilepsy (TLE) and compare the occurrence of these disorders in subjects before and after surgery. Methods Cross-sectional study with quantitative analysis, exploratory type. A questionnaire for data collection was administered covering the following aspects: oral language, speech complaints, and writing production and comprehension. Criteria for inclusion of subjects were a diagnosis of TLE refractory to drug treatment and at least 4 years of schooling. Results The sample of 63 patients with TLE was divided into two groups: presurgical (n = 31) and postsurgical (n = 32). In the postsurgical group, there was a higher frequency of left lobectomy (75%) than right (25%). Conclusion Statistical analysis was performed with the chi-square test (significance level of 0.05). Complaints related to speech-language attention were more predominant in postsurgical subjects. Analysis of oral language, speech, and written language in subjects with epilepsy who underwent temporal lobectomy or not showed findings consistent with symptoms related to transient aphasia, with the presence of paraphasias, as well as changes in speech prosody and melody. These symptoms appeared more associated with recurrence after having a temporal lobectomy.
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Affiliation(s)
- Ana Paula Berberian
- Masters and Doctorate Program in Communication Disorders, Universidade Tuiuti do Paraná, Curitiba, Paraná, Brazil
| | - Christiane Hopker
- Masters and Doctorate Program in Communication Disorders, Universidade Tuiuti do Paraná, Curitiba, Paraná, Brazil
| | - Ingrid Mazzarotto
- Masters and Doctorate Program in Communication Disorders, Universidade Tuiuti do Paraná, Curitiba, Paraná, Brazil
| | - Jenane Cunha
- Masters and Doctorate Program in Communication Disorders, Universidade Tuiuti do Paraná, Curitiba, Paraná, Brazil
| | - Ana Cristina Guarinello
- Masters and Doctorate Program in Communication Disorders, Universidade Tuiuti do Paraná, Curitiba, Paraná, Brazil
| | - Giselle Massi
- Masters and Doctorate Program in Communication Disorders, Universidade Tuiuti do Paraná, Curitiba, Paraná, Brazil
| | - Ana Crippa
- Department of Neurophysiology, Universidade Federal do Paraná, Curitiba, Brazil
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41
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Riès SK, Karzmark CR, Navarrete E, Knight RT, Dronkers NF. Specifying the role of the left prefrontal cortex in word selection. BRAIN AND LANGUAGE 2015; 149:135-47. [PMID: 26291289 PMCID: PMC4712683 DOI: 10.1016/j.bandl.2015.07.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 07/13/2015] [Accepted: 07/15/2015] [Indexed: 05/24/2023]
Abstract
Word selection allows us to choose words during language production. This is often viewed as a competitive process wherein a lexical representation is retrieved among semantically-related alternatives. The left prefrontal cortex (LPFC) is thought to help overcome competition for word selection through top-down control. However, whether the LPFC is always necessary for word selection remains unclear. We tested 6 LPFC-injured patients and controls in two picture naming paradigms varying in terms of item repetition. Both paradigms elicited the expected semantic interference effects (SIE), reflecting interference caused by semantically-related representations in word selection. However, LPFC patients as a group showed a larger SIE than controls only in the paradigm involving item repetition. We argue that item repetition increases interference caused by semantically-related alternatives, resulting in increased LPFC-dependent cognitive control demands. The remaining network of brain regions associated with word selection appears to be sufficient when items are not repeated.
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Affiliation(s)
- S K Riès
- Department of Psychology and Helen Wills Neuroscience Institute, University of California, Berkeley, USA; Veterans Affairs Northern California Health Care System, Martinez, USA.
| | - C R Karzmark
- Department of Psychology and Helen Wills Neuroscience Institute, University of California, Berkeley, USA
| | - E Navarrete
- Dipartimento di Psicologia dello Sviluppo e della Socializzazione, Università di Padova, Italy
| | - R T Knight
- Department of Psychology and Helen Wills Neuroscience Institute, University of California, Berkeley, USA
| | - N F Dronkers
- Veterans Affairs Northern California Health Care System, Martinez, USA; University of California, Davis, USA; National Research University Higher School of Economics, Russian Federation
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Zhao F, Kang H, You L, Rastogi P, Venkatesh D, Chandra M. Neuropsychological deficits in temporal lobe epilepsy: A comprehensive review. Ann Indian Acad Neurol 2015; 17:374-82. [PMID: 25506156 PMCID: PMC4251008 DOI: 10.4103/0972-2327.144003] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 03/24/2014] [Accepted: 03/24/2014] [Indexed: 11/23/2022] Open
Abstract
Temporal lobe epilepsy (TLE) is the most prevalent form of complex partial seizures with temporal lobe origin of electrical abnormality. Studies have shown that recurrent seizures affect all aspects of cognitive functioning, including memory, language, praxis, executive functions, and social judgment, among several others. In this article, we will review these cognitive impairments along with their neuropathological correlates in a comprehensive manner. We will see that neuropsychological deficits are prevalent in TLE. Much of the effort has been laid on memory due to the notion that temporal lobe brain structures involved in TLE play a central role in consolidating information into memory. It seems that damage to the mesial structure of the temporal lobe, particularly the amygdale and hippocampus, has the main role in these memory difficulties and the neurobiological plausibility of the role of the temporal lobe in different aspects of memory. Here, we will cover the sub-domains of working memory and episodic memory deficits. This is we will further proceed to evaluate the evidences of executive function deficits in TLE and will see that set-shifting among other EFs is specifically affected in TLE as is social cognition. Finally, critical components of language related deficits are also found in the form of word-finding difficulties. To conclude, TLE affects several of cognitive function domains, but the etiopathogenesis of all these dysfunctions remain elusive. Further well-designed studies are needed for a better understanding of these disorders.
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Affiliation(s)
- Fengqing Zhao
- Department of Emergency, Yantai Yuhuangding Hospital, Yantai 264000, Shandong Province, China
| | - Hai Kang
- Department of Emergency, Yantai Yuhuangding Hospital, Yantai 264000, Shandong Province, China
| | - Libo You
- Operating RoomYantaishan Hospital, Yantai 264000, Shandong Province, China
| | - Priyanka Rastogi
- Department of Clinical Psychology, Ranchi Institute of Neuropsychiatry and Allied Sciences, Kanke, Ranchi, Jharkhand, India
| | - D Venkatesh
- Department of Physiology, M. S. Ramaiah Medical College, Mathikere, Bengaluru, Karnataka, India
| | - Mina Chandra
- Department of Psychiatry, Post Graduate Institute of Medical Education and Research and Dr. Ram Manohar Lohia Hospital, Formerly Willingdon Hospital, New Delhi, India
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Campo P, Poch C, Toledano R, Igoa JM, Belinchón M, García-Morales I, Gil-Nagel A. Visual object naming in patients with small lesions centered at the left temporopolar region. Brain Struct Funct 2014; 221:473-85. [DOI: 10.1007/s00429-014-0919-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2014] [Accepted: 10/15/2014] [Indexed: 10/24/2022]
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Object and proper name retrieval in temporal lobe epilepsy: a study of difficulties and latencies. Epilepsy Res 2014; 108:1825-38. [PMID: 25277884 DOI: 10.1016/j.eplepsyres.2014.09.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 08/19/2014] [Accepted: 09/06/2014] [Indexed: 11/22/2022]
Abstract
PURPOSE Retrieving a specific name is sometimes difficult and can be even harder when pathology affects the temporal lobes. Word finding difficulties have been well documented in temporal lobe epilepsy (TLE) but analyses have mostly concentrated on the study of accuracy. Our aim here was to go beyond simple accuracy and to provide both a quantitative and a qualitative assessment of naming difficulties and latencies in patients with TLE. METHODS Thirty-two patients with temporal lobe epilepsy (16 with epilepsy affecting the cerebral hemisphere dominant for language (D-TLE) and 16 with epilepsy affecting the cerebral hemisphere non-dominant for language (ND-TLE)) and 34 healthy matched control subjects were included in the study. The experiment involved naming 70 photographs of objects and 70 photographs of celebrities as fast as possible. Accuracy and naming reaction times were recorded. Following each trial, a questionnaire was used to determine the specific nature of each subject's difficulty in retrieving the name (e.g., no difficulty, paraphasia, tip of the tongue, feeling of knowing the name, etc). Reaction times were analysed both across subjects and across trials. KEY FINDINGS D-TLE patients showed consistent and quasi-systematic impairment compared to matched control subjects on both object and famous people naming. This impairment was characterized not only by lower accuracy but also by more qualitative errors and tip of the tongue phenomena. Furthermore, minimum reaction times were slowed down by about 70 ms for objects and 150 ms for famous people naming. In contrast, patients with ND-TLE were less impaired, and their impairment was limited to object naming. SIGNIFICANCE These results suggest that patients with TLE, in particular D-TLE, show a general impairment of lexical access. Furthermore, there was evidence of subtle difficulties (increased reaction times) in patients with TLE.
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Pustina D, Doucet G, Sperling M, Sharan A, Tracy J. Increased microstructural white matter correlations in left, but not right, temporal lobe epilepsy. Hum Brain Mapp 2014; 36:85-98. [PMID: 25137314 DOI: 10.1002/hbm.22614] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 07/04/2014] [Accepted: 08/11/2014] [Indexed: 11/06/2022] Open
Abstract
Microstructural white matter tract correlations have been shown to reflect known patterns of phylogenetic development and functional specialization in healthy subjects. The aim of this study was to establish intertract correlations in a group of controls and to examine potential deviations from normality in temporal lobe epilepsy (TLE). We investigated intertract correlations in 28 healthy controls, 21 left TLE (LTLE) and 23 right TLE (RTLE). Nine tracts were investigated, comprising the parahippocampal fasciculi, the uncinate fasciculi, the arcuate fasciculi, the frontoparietal tracts, and the fornix. An abnormal increase in tract correlations was observed in LTLE, while RTLE showed intertract correlations similar to controls. In the control group, tract correlations increased with increasing fractional anisotropy (FA), while in the TLE groups tract correlations increased with decreasing FA. Cluster analyses revealed agglomeration of bilateral pairs of homologous tracts in healthy subjects, with such pairs separated in our LTLE and RTLE groups. Discriminant analyses aimed at distinguishing LTLE from RTLE, revealing that tract correlations produce higher rates of accurate group classification than FA values. Our results confirm and extend previous work by showing that LTLE compared to RTLE patients display not only more extensive losses in microstructural orientation but also more aberrant intertract correlations. Aberrant correlations may be related to pathologic processes (i.e., seizure spread) or to adaptive processes aimed at preserving key cognitive functions. Our data suggest that tract correlations may have predictive value in distinguishing LTLE from RTLE, potentially moving diffusion imaging to a place of greater prominence in clinical practice.
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Affiliation(s)
- Dorian Pustina
- Department of Neurology, Thomas Jefferson University, Philadelphia, Pennsylvania
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Bartha-Doering L, Trinka E. The interictal language profile in adult epilepsy. Epilepsia 2014; 55:1512-25. [PMID: 25110150 DOI: 10.1111/epi.12743] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/30/2014] [Indexed: 11/29/2022]
Abstract
OBJECTIVE The purpose of this study was to systematically review the literature on the interictal language profile in adult patients with epilepsy. METHODS An extensive literature search was performed using MEDLINE, Embase, PsycINFO, Cochrane Central Register of Controlled Trials, PASCAL, and PSYNDEXplus databases. Key aspects of inclusion criteria were adult patients with epilepsy, patient number >10, and in-depth qualitative investigations of a specific language modality or administration of tests of at least two different language modalities, including comprehension, naming, repetition, reading, writing, and spontaneous speech. RESULTS Our search strategy yielded 933 articles on epilepsy and language. Of these, 31 met final eligibility criteria. Most included articles focused on temporal lobe epilepsy; only three studies were interested in the language profile of patients with idiopathic generalized epilepsies, and one study on frontal lobe epilepsy met inclusion criteria. Study results showed a pronounced heterogeneity of language abilities in patients with epilepsy, varying from intact language profiles to impairment in several language functions. However, at least 17% of patients displayed deficits in more than one language function, with naming, reading comprehension, spontaneous speech, and discourse production being most often affected. SIGNIFICANCE This review underscores the need to evaluate different language functions-including spontaneous speech, discourse abilities, naming, auditory and reading comprehension, reading, writing, and repetition-individually in order to obtain a reliable profile of language functioning in patients with epilepsy. Moreover, our findings show that in contrast to the huge scientific interest of memory functions in epilepsy, the examination of language functions so far played a minor role in epilepsy research, emphasizing the need for future research activities in this field.
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Affiliation(s)
- Lisa Bartha-Doering
- Department of Pediatrics and Adolescent Medicine, Medical University, Vienna, Austria
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Hamamé CM, Alario FX, Llorens A, Liégeois-Chauvel C, Trébuchon-Da Fonseca A. High frequency gamma activity in the left hippocampus predicts visual object naming performance. BRAIN AND LANGUAGE 2014; 135:104-114. [PMID: 25016093 DOI: 10.1016/j.bandl.2014.05.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 04/14/2014] [Accepted: 05/26/2014] [Indexed: 06/03/2023]
Abstract
Access to an object's name requires the retrieval of an arbitrary association between it's identity and a word-label. The hippocampus is essential in retrieving arbitrary associations, and thus could be involved in retrieving the link between an object and its name. To test this hypothesis we recorded the iEEG signal from epileptic patients, directly implanted in the hippocampus, while they performed a picture naming task. High-frequency broadband gamma (50-150 Hz) responses were computed as an index of population-level spiking activity. Our results show, for the first time, single-trial hippocampal dynamics between visual confrontation and naming. Remarkably, the latency of the hippocampal response predicts naming latency, while inefficient hippocampal activation is associated with "tip-of-the-tongue" states (a failure to retrieve the name of a recognized object) suggesting that the hippocampus is an active component of the naming network and that its dynamics are closely related to efficient word production.
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Affiliation(s)
- Carlos M Hamamé
- Aix-Marseille Université, CNRS, LPC UMR 7290, Marseille 13001, France.
| | - F-Xavier Alario
- Aix-Marseille Université, CNRS, LPC UMR 7290, Marseille 13001, France
| | - Anais Llorens
- Aix-Marseille Université, CNRS, LPC UMR 7290, Marseille 13001, France; Aix-Marseille Université, Inserm, INS UMR_S 1106, Marseille 13005, France
| | | | - Agnés Trébuchon-Da Fonseca
- Aix-Marseille Université, Inserm, INS UMR_S 1106, Marseille 13005, France; APHM, Centre Hospitalier de la Timone, Marseille 13005, France
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48
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Li H, Xue Z, Dulay MF, Verma A, Karmonik C, Grossman RG, Wong ST. Fractional anisotropy asymmetry and the side of seizure origin for partial onset-temporal lobe epilepsy. Comput Med Imaging Graph 2014; 38:481-9. [PMID: 25037096 DOI: 10.1016/j.compmedimag.2014.06.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 04/30/2014] [Accepted: 06/16/2014] [Indexed: 11/17/2022]
Abstract
This paper presents a fractional anisotropy asymmetry (FAA) method to detect the asymmetry of white matter (WM) integrity and its correlation with the side of seizure origin for partial onset temporal lobe epilepsy (TLE) using diffusion tensor image (DTI). In this study, FAA analysis is applied to 30 patients of partial TLE (15 left, 15 right) and 14 matched normal controls. Specifically, after registering all the images with the JHU-DTI-MNI template the average FA value of each FA skeleton section is calculated using the tract-based spatial statistics (TBSS) method. Then, FAA is calculated to quantify the WM diffusivity asymmetry of the corresponding region-pairs between the left and right hemispheres. Using FAA the regional asymmetry contributing significantly to the group differences of controls and left/right TLE, as well as the left and right TLE, is identified. As a comparison, the ROI-based average FA values for WM and corresponding FAAs are also calculated. TBSS-based analysis reflects the average of local maximal FA values along the white matter skeleton sections, and ROI-based analysis shows the average of WM FA values within each anatomical region. The FAA statistical results indicated that the FA values of anatomical region-pairs are asymmetric in the ipsilateral hemisphere with seizure origin against the contralateral hemisphere. Particularly, FAA values within the temporal lobe (superior, middle, and inferior temporal WM) are significantly different between the left and right TLE patients, consistently found from both analysis methods. The study suggests that FAA values can be potentially used to identify the seizures of origin of TLE and to help understand the relationship between fiber tracts with the side of seizure origin of TLE.
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Affiliation(s)
- Hai Li
- Department of Systems Medicine and Bioengineering, Houston Methodist Research Institute, Weill Cornell Medical College, Houston, TX, United States; Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Science, Hefei, China
| | - Zhong Xue
- Department of Systems Medicine and Bioengineering, Houston Methodist Research Institute, Weill Cornell Medical College, Houston, TX, United States.
| | - Mario F Dulay
- Department of Neurosurgery, Houston Methodist Hospital, Weill Cornell Medical College, Houston, TX, United States
| | - Amit Verma
- Department of Neurosurgery, Houston Methodist Hospital, Weill Cornell Medical College, Houston, TX, United States
| | - Christof Karmonik
- Department of Neurosurgery, Houston Methodist Hospital, Weill Cornell Medical College, Houston, TX, United States
| | - Robert G Grossman
- Department of Neurosurgery, Houston Methodist Hospital, Weill Cornell Medical College, Houston, TX, United States
| | - Stephen T Wong
- Department of Systems Medicine and Bioengineering, Houston Methodist Research Institute, Weill Cornell Medical College, Houston, TX, United States
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49
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Abstract
Much of our knowledge of functional brain anatomy is based on lesion-deficit studies. Mah et al. show that the established methodology for conducting these — voxel-wise mass univariate inference — mislocalises function owing to complex correlations in natural patterns of damage across the brain; a problem soluble only by high-dimensional multivariate inference. Our knowledge of the anatomical organization of the human brain in health and disease draws heavily on the study of patients with focal brain lesions. Historically the first method of mapping brain function, it is still potentially the most powerful, establishing the necessity of any putative neural substrate for a given function or deficit. Great inferential power, however, carries a crucial vulnerability: without stronger alternatives any consistent error cannot be easily detected. A hitherto unexamined source of such error is the structure of the high-dimensional distribution of patterns of focal damage, especially in ischaemic injury—the commonest aetiology in lesion-deficit studies—where the anatomy is naturally shaped by the architecture of the vascular tree. This distribution is so complex that analysis of lesion data sets of conventional size cannot illuminate its structure, leaving us in the dark about the presence or absence of such error. To examine this crucial question we assembled the largest known set of focal brain lesions (n = 581), derived from unselected patients with acute ischaemic injury (mean age = 62.3 years, standard deviation = 17.8, male:female ratio = 0.547), visualized with diffusion-weighted magnetic resonance imaging, and processed with validated automated lesion segmentation routines. High-dimensional analysis of this data revealed a hidden bias within the multivariate patterns of damage that will consistently distort lesion-deficit maps, displacing inferred critical regions from their true locations, in a manner opaque to replication. Quantifying the size of this mislocalization demonstrates that past lesion-deficit relationships estimated with conventional inferential methodology are likely to be significantly displaced, by a magnitude dependent on the unknown underlying lesion-deficit relationship itself. Past studies therefore cannot be retrospectively corrected, except by new knowledge that would render them redundant. Positively, we show that novel machine learning techniques employing high-dimensional inference can nonetheless accurately converge on the true locus. We conclude that current inferences about human brain function and deficits based on lesion mapping must be re-evaluated with methodology that adequately captures the high-dimensional structure of lesion data.
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Affiliation(s)
- Yee-Haur Mah
- 1 Institute of Neurology, UCL, London, WC1N 3BG, UK
| | - Masud Husain
- 1 Institute of Neurology, UCL, London, WC1N 3BG, UK2 Department of Clinical Neurology, University of Oxford, Oxford OX3 9DU, UK3 Institute of Cognitive Neuroscience, UCL, London WC1N 3AR, UK
| | - Geraint Rees
- 1 Institute of Neurology, UCL, London, WC1N 3BG, UK3 Institute of Cognitive Neuroscience, UCL, London WC1N 3AR, UK4 Wellcome Trust Centre for Neuroimaging, UCL, London WC1N 3BG, UK
| | - Parashkev Nachev
- 1 Institute of Neurology, UCL, London, WC1N 3BG, UK3 Institute of Cognitive Neuroscience, UCL, London WC1N 3AR, UK
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50
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Verbal Fluency in Focal Epilepsy: A Systematic Review and Meta-analysis. Neuropsychol Rev 2014; 24:200-18. [DOI: 10.1007/s11065-014-9255-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Accepted: 02/28/2014] [Indexed: 10/25/2022]
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