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Hoyau E, Boudiaf N, Cousin E, Pichat C, Fournet N, Krainik A, Jaillard A, Baciu M. Aging Modulates the Hemispheric Specialization during Word Production. Front Aging Neurosci 2017; 9:125. [PMID: 28536520 PMCID: PMC5422531 DOI: 10.3389/fnagi.2017.00125] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 04/13/2017] [Indexed: 11/13/2022] Open
Abstract
Although older adults exhibit normal accuracy in performing word retrieval and generation (lexical production; e.g., object naming), they are generally slower in responding than younger adults. To maintain accuracy, older adults recruit compensatory mechanisms and strategies. We focused on two such possible compensatory mechanisms, one semantic and one executive. These mechanisms are reflected at inter- and intra-hemispheric levels by various patterns of reorganization of lexical production cerebral networks. Hemispheric reorganization (HR) changes were also evaluated in relation to increase naming latencies. Using functional magnetic resonance imaging (fMRI), we examined 27 healthy participants (from 30 years to 85 years) during an object naming task, exploring and identifying task-related patterns of cerebral reorganization. We report two main results. First, we observed a left intra-hemispheric pattern of reorganization, the left anterior-posterior aging (LAPA) effect, consisting of supplementary activation of left posterior (temporo-parietal) regions in older adults and asymmetric activation along the left fronto-temporal axis. This pattern suggests that older adults recruit posterior semantic regions to perform object naming. The second finding consisted of bilateral recruitment of frontal regions to maintain appropriate response times, especially in older adults who were faster performers. This pattern is discussed in terms of compensatory mechanism. We suggest that aging is associated with multiple, co-existing compensation and reorganization mechanisms and patterns associated with lexical production.
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Affiliation(s)
- Elena Hoyau
- CNRS LPNC UMR 5105, Laboratoire de Psychologie et Neurocognition, Université Grenoble AlpesGrenoble, France
| | - Naila Boudiaf
- CNRS LPNC UMR 5105, Laboratoire de Psychologie et Neurocognition, Université Grenoble AlpesGrenoble, France
| | - Emilie Cousin
- CNRS LPNC UMR 5105, Laboratoire de Psychologie et Neurocognition, Université Grenoble AlpesGrenoble, France.,UMS IRMaGe CHU, Université Grenoble AlpesGrenoble, France
| | - Cedric Pichat
- CNRS LPNC UMR 5105, Laboratoire de Psychologie et Neurocognition, Université Grenoble AlpesGrenoble, France
| | | | - Alexandre Krainik
- UMS IRMaGe CHU, Université Grenoble AlpesGrenoble, France.,Grenoble Institute of Neuroscience, Université Grenoble AlpesGrenoble, France
| | - Assia Jaillard
- UMS IRMaGe CHU, Université Grenoble AlpesGrenoble, France
| | - Monica Baciu
- CNRS LPNC UMR 5105, Laboratoire de Psychologie et Neurocognition, Université Grenoble AlpesGrenoble, France
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Darkow R, Martin A, Würtz A, Flöel A, Meinzer M. Transcranial direct current stimulation effects on neural processing in post-stroke aphasia. Hum Brain Mapp 2016; 38:1518-1531. [PMID: 27859982 DOI: 10.1002/hbm.23469] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Revised: 10/14/2016] [Accepted: 11/06/2016] [Indexed: 12/18/2022] Open
Abstract
Non-invasive transcranial direct current stimulation (tDCS) can enhance recovery after stroke. However, fundamental knowledge about how tDCS impacts neural processing in the lesioned human brain is currently lacking. In the present study, it was investigated how tDCS modulates brain function in patients with post-stroke language impairment (aphasia). In a cross-over, randomized trial, patients named pictures of common objects during functional magnetic resonance imaging (fMRI). Concurrently, excitatory (anodal-) or sham-tDCS (1 mA, 20 min, or 30 s, respectively) was administered to the left primary motor cortex, a montage with demonstrated potential to improve aphasic language. By choosing stimuli that could reliable be named by the patients, the authors aimed to derive a pure measure of stimulation effects that was independent of treatment or performance effects and to assess how tDCS interacts with the patients' residual language network. Univariate fMRI data analysis revealed reduced activity in domain-general regions mediating high-level cognitive control during anodal-tDCS. Independent component functional network analysis demonstrated selectively increased language network activity and an inter-correlated shift from higher to lower frequency bands, indicative of increased within-network communication. Compared with healthy controls, anodal-tDCS resulted in overall "normalization" of brain function in the patients. These results demonstrate for the first time how tDCS modulates neural processing in stroke patients. Such information is crucial to assure that behavioral treatments targeting specific neural circuits overlap with regions that are modulated by tDCS, thereby maximizing stimulation effects during therapy. Hum Brain Mapp 38:1518-1531, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Robert Darkow
- Department of Neurology, NeuroCure Clinical Research Center, and Center of Stroke Research Berlin, Berlin, Charité University Medicine, Berlin, 10117, Germany
| | - Andrew Martin
- The University of Queensland, Centre for Clinical Research, Brisbane Queensland, 4029, Australia
| | - Anna Würtz
- Department of Neurology, NeuroCure Clinical Research Center, and Center of Stroke Research Berlin, Berlin, Charité University Medicine, Berlin, 10117, Germany
| | - Agnes Flöel
- Department of Neurology, NeuroCure Clinical Research Center, and Center of Stroke Research Berlin, Berlin, Charité University Medicine, Berlin, 10117, Germany
| | - Marcus Meinzer
- Department of Neurology, NeuroCure Clinical Research Center, and Center of Stroke Research Berlin, Berlin, Charité University Medicine, Berlin, 10117, Germany.,The University of Queensland, Centre for Clinical Research, Brisbane Queensland, 4029, Australia
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MacDonald AD, Heath S, McMahon KL, Nickels L, Angwin AJ, van Hees S, Johnson K, Copland DA. Neuroimaging the short- and long-term effects of repeated picture naming in healthy older adults. Neuropsychologia 2015; 75:170-8. [PMID: 26071256 DOI: 10.1016/j.neuropsychologia.2015.06.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 05/18/2015] [Accepted: 06/05/2015] [Indexed: 11/15/2022]
Abstract
Repeated attempts to name pictures can improve subsequent naming for aphasic individuals with anomia, however, the neurocognitive mechanisms responsible for such improvements are unknown. This study investigated repeated picture naming in healthy older adults over a period of minutes (short-term) after one repetition and a period of days (long-term) after multiple repetitions. Compared to unprimed pictures, both repeated conditions showed faster naming latencies with the fastest latencies evident for the short-term condition. Neuroimaging results identified repetition suppression effects across three left inferior frontal gyrus regions of interest: for both the short- and long-term conditions in the pars orbitalis, and for long-term items in the pars triangularis and pars opercularis regions. The whole brain analysis also showed a repetition suppression effect in bilateral pars triangularis regions for the long-term condition. These findings within the inferior frontal gyrus suggest that effects of repeated naming may be driven by a mapping mechanism across multiple levels of representation, possibly reflecting different levels of learning, and lend support to the idea that processing may be hierarchically organised in the left inferior frontal gyrus. The whole brain analysis also revealed repetition suppression for the long-term condition within the posterior portion of bilateral inferior temporal gyri, which may reflect attenuation of integration processes within this region following the learning of task-relevant information.
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Affiliation(s)
- Anna D MacDonald
- The University of Queensland, UQ Centre for Clinical Research, Brisbane, Australia; NHMRC Centre for Clinical Research Excellence in Aphasia Rehabilitation, Australia.
| | - Shiree Heath
- Macquarie University, ARC Centre of Excellence in Cognition and its Disorders, Department of Cognitive Science, Sydney, Australia.
| | - Katie L McMahon
- The University of Queensland, Centre for Advanced Imaging, Brisbane, Australia.
| | - Lyndsey Nickels
- NHMRC Centre for Clinical Research Excellence in Aphasia Rehabilitation, Australia; Macquarie University, ARC Centre of Excellence in Cognition and its Disorders, Department of Cognitive Science, Sydney, Australia.
| | - Anthony J Angwin
- NHMRC Centre for Clinical Research Excellence in Aphasia Rehabilitation, Australia; The University of Queensland, School of Health and Rehabilitation Sciences, Division of Speech Pathology, Brisbane, Australia.
| | - Sophia van Hees
- The University of Queensland, UQ Centre for Clinical Research, Brisbane, Australia; NHMRC Centre for Clinical Research Excellence in Aphasia Rehabilitation, Australia; The University of Queensland, School of Health and Rehabilitation Sciences, Division of Speech Pathology, Brisbane, Australia.
| | - Kori Johnson
- The University of Queensland, Centre for Advanced Imaging, Brisbane, Australia.
| | - David A Copland
- The University of Queensland, UQ Centre for Clinical Research, Brisbane, Australia; NHMRC Centre for Clinical Research Excellence in Aphasia Rehabilitation, Australia; The University of Queensland, School of Health and Rehabilitation Sciences, Division of Speech Pathology, Brisbane, Australia.
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A common functional neural network for overt production of speech and gesture. Neuroscience 2015; 284:29-41. [DOI: 10.1016/j.neuroscience.2014.09.067] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 09/01/2014] [Accepted: 09/03/2014] [Indexed: 11/23/2022]
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van Hees S, McMahon K, Angwin A, de Zubicaray G, Copland DA. Neural activity associated with semantic versus phonological anomia treatments in aphasia. BRAIN AND LANGUAGE 2014; 129:47-57. [PMID: 24556337 DOI: 10.1016/j.bandl.2013.12.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 12/20/2013] [Accepted: 12/30/2013] [Indexed: 06/03/2023]
Abstract
Naming impairments in aphasia are typically targeted using semantic and/or phonologically based tasks. However, it is not known whether these treatments have different neural mechanisms. Eight participants with aphasia received twelve treatment sessions using an alternating treatment design, with fMRI scans pre- and post-treatment. Half the sessions employed Phonological Components Analysis (PCA), and half the sessions employed Semantic Feature Analysis (SFA). Pre-treatment activity in the left caudate correlated with greater immediate treatment success for items treated with SFA, whereas recruitment of the left supramarginal gyrus and right precuneus post-treatment correlated with greater immediate treatment success for items treated with PCA. The results support previous studies that have found greater treatment outcome to be associated with activity in predominantly left hemisphere regions, and suggest that different mechanisms may be engaged dependent on the type of treatment employed.
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Affiliation(s)
- Sophia van Hees
- University of Queensland Centre for Clinical Research, Herston, QLD 4029, Australia; School of Health and Rehabilitation Sciences, University of Queensland, St. Lucia, QLD 4072, Australia; Centre for Advanced Imaging, University of Queensland, St. Lucia, QLD 4072, Australia.
| | - Katie McMahon
- Centre for Advanced Imaging, University of Queensland, St. Lucia, QLD 4072, Australia; Wesley Hospital, Auchenflower, QLD 4066, Australia.
| | - Anthony Angwin
- School of Health and Rehabilitation Sciences, University of Queensland, St. Lucia, QLD 4072, Australia.
| | - Greig de Zubicaray
- School of Psychology, University of Queensland, St. Lucia, QLD 4072, Australia.
| | - David A Copland
- University of Queensland Centre for Clinical Research, Herston, QLD 4029, Australia; School of Health and Rehabilitation Sciences, University of Queensland, St. Lucia, QLD 4072, Australia; Clinical Centre for Research Excellence in Aphasia Rehabilitation, Australia.
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Dohn A, Garza-Villarreal EA, Chakravarty MM, Hansen M, Lerch JP, Vuust P. Gray- and White-Matter Anatomy of Absolute Pitch Possessors. Cereb Cortex 2013; 25:1379-88. [DOI: 10.1093/cercor/bht334] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
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Heath S, McMahon KL, Nickels L, Angwin A, MacDonald AD, van Hees S, McKinnon E, Johnson K, Copland DA. Facilitation of naming in aphasia with auditory repetition: an investigation of neurocognitive mechanisms. Neuropsychologia 2013; 51:1534-48. [PMID: 23684849 DOI: 10.1016/j.neuropsychologia.2013.05.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2012] [Revised: 01/19/2013] [Accepted: 05/07/2013] [Indexed: 11/13/2022]
Abstract
Prior phonological processing can enhance subsequent picture naming performance in individuals with aphasia, yet the neurocognitive mechanisms underlying this effect and its longevity are unknown. This study used functional magnetic resonance imaging to examine the short-term (within minutes) and long-term (within days) facilitation effects from a phonological task in both participants with aphasia and age-matched controls. Results for control participants suggested that long-term facilitation of subsequent picture naming may be driven by a strengthening of semantic-phonological connections, while semantic and object recognition mechanisms underlie more short-term effects. All participants with aphasia significantly improved in naming accuracy following both short- and long-term facilitation. A descriptive comparison of the neuroimaging results identified different patterns of activation for each individual with aphasia. The exclusive engagement of a left hemisphere phonological network underlying facilitation was not revealed. The findings suggest that improved naming in aphasia with phonological tasks may be supported by changes in right hemisphere activity in some individuals and reveal the potential contribution of the cerebellum to improved naming following phonological facilitation. Conclusions must be interpreted with caution, however, due to the comparison of corrected group control results to that of individual participants with aphasia, which were not corrected for multiple comparisons.
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Affiliation(s)
- Shiree Heath
- University of Queensland, Language Neuroscience Laboratory, Centre for Clinical Research, Royal Brisbane & Women's Hospital, Level 3, Building 71/918, Herston, Queensland 4029, Australia.
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