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Collette F, Lawson G, Hassid S, Delahaut G, Bachy V, Van Der Vorst S, Faugeras L, Gilliaux Q, D'Hondt L. Aggressive recurrent respiratory papillomatosis: A series of five consecutive patients successfully treated with adjuvant intravenous bevacizumab. A single Belgian academic center experience. Head Neck 2023; 45:1071-1079. [PMID: 36840929 DOI: 10.1002/hed.27300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 12/22/2022] [Accepted: 01/23/2023] [Indexed: 02/26/2023] Open
Abstract
BACKGROUND Recurrent respiratory papillomatosis (RRP) is a currently incurable benign neoplasm caused by human papilloma virus (HPV) infection. It usually reduces voice, respiratory, and general quality of life, and is sometimes life-threatening. Patients usually need repeated operations. The use of adjuvant bevacizumab, a monoclonal antibody targeting vascular endothelial growth factor A, has been described in several case reports, with a good efficacy and safety profile. METHODS We report the cases of five patients with aggressive RRP who were treated with adjuvant systemic bevacizumab in a single Belgian tertiary center. RESULTS A complete response was achieved in four patients after a median of 4.5 months, and a partial response in one. In all cases, the number of surgeries was drastically reduced, and quality of life improved. Toxicity was easily managed. CONCLUSIONS Systemic bevacizumab seems to be an effective and safe adjuvant treatment for aggressive RRP.
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Affiliation(s)
- Fanny Collette
- Department of Oncology, Université Catholique de Louvain, CHU UCL Namur, Yvoir, Belgium
| | - Georges Lawson
- Department of ENT and Head and Neck Surgery, Université Catholique de Louvain, CHU UCL Namur, Yvoir, Belgium
| | - Samantha Hassid
- Department of ENT and Head and Neck Surgery, Université Catholique de Louvain, CHU UCL Namur, Yvoir, Belgium
| | - Gilles Delahaut
- Department of ENT and Head and Neck Surgery, Université Catholique de Louvain, CHU UCL Namur, Yvoir, Belgium
| | - Vincent Bachy
- Department of ENT and Head and Neck Surgery, Université Catholique de Louvain, CHU UCL Namur, Yvoir, Belgium
| | - Sébastien Van Der Vorst
- Department of ENT and Head and Neck Surgery, Université Catholique de Louvain, CHU UCL Namur, Yvoir, Belgium
| | - Laurence Faugeras
- Department of Oncology, Université Catholique de Louvain, CHU UCL Namur, Yvoir, Belgium
| | - Quentin Gilliaux
- Department of Oncology, Université Catholique de Louvain, CHU UCL Namur, Yvoir, Belgium
| | - Lionel D'Hondt
- Department of Oncology, Université Catholique de Louvain, CHU UCL Namur, Yvoir, Belgium
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Guillemin C, Hammad G, Read J, Requier F, Charonitis M, Delrue G, Vandeleene N, Lommers E, Maquet P, Collette F. Pupil response speed as a marker of cognitive fatigue in early Multiple Sclerosis. Mult Scler Relat Disord 2022; 65:104001. [DOI: 10.1016/j.msard.2022.104001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/10/2022] [Accepted: 06/24/2022] [Indexed: 10/17/2022]
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Jedidi Z, Manard M, Balteau E, Degueldre C, Luxen A, Phillips C, Collette F, Maquet P, Majerus S. Corrigendum to: Incidental Verbal Semantic Processing Recruits the Fronto-temporal Semantic Control Network. Cereb Cortex 2021; 31:4864. [PMID: 34274965 DOI: 10.1093/cercor/bhab250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/21/2021] [Accepted: 05/25/2021] [Indexed: 11/13/2022] Open
Affiliation(s)
- Z Jedidi
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium.,Department of Neurology, CHU Liège, Domaine Universitaire du Sart-Tilman, 4000 Liège, Belgium
| | - M Manard
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium
| | - E Balteau
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium
| | - C Degueldre
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium
| | - A Luxen
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium
| | - C Phillips
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium
| | - F Collette
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium
| | - P Maquet
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium.,Department of Neurology, CHU Liège, Domaine Universitaire du Sart-Tilman, 4000 Liège, Belgium
| | - S Majerus
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium.,Psychology & Neuroscience of Cognition Research Unit, University of Liège, 4000 Liège, Belgium.,Fund for Scientific Research - FNRS, 1000 Brussels, Belgium
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Jedidi Z, Manard M, Balteau E, Degueldre C, Luxen A, Philips C, Collette F, Maquet P, Majerus S. Incidental Verbal Semantic Processing Recruits the Fronto-temporal Semantic Control Network. Cereb Cortex 2021; 31:5449-5459. [PMID: 34180511 DOI: 10.1093/cercor/bhab169] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/21/2021] [Accepted: 05/25/2021] [Indexed: 11/12/2022] Open
Abstract
The frontoparietal semantic network, encompassing the inferior frontal gyrus and the posterior middle temporal cortex, is considered to be involved in semantic control processes. The explicit versus implicit nature of these control processes remains however poorly understood. The present study examined this question by assessing regional brain responses to the semantic attributes of an unattended stream of auditory words while participants' top-down attentional control processes were absorbed by a demanding visual search task. Response selectivity to semantic aspects of verbal stimuli was assessed via a functional magnetic resonance imaging response adaptation paradigm. We observed that implicit semantic processing of an unattended verbal stream recruited not only unimodal and amodal cortices in posterior supporting semantic knowledge areas, but also inferior frontal and posterior middle temporal areas considered to be part of the semantic control network. These results indicate that frontotemporal semantic networks support incidental semantic (control) processes.
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Affiliation(s)
- Z Jedidi
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium.,Department of Neurology, CHU Liège, Domaine Universitaire du Sart-Tilman, 4000 Liège, Belgium
| | - M Manard
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium
| | - E Balteau
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium
| | - C Degueldre
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium
| | - A Luxen
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium
| | - C Philips
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium
| | - F Collette
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium
| | - P Maquet
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium.,Department of Neurology, CHU Liège, Domaine Universitaire du Sart-Tilman, 4000 Liège, Belgium
| | - S Majerus
- GIGA - Cyclotron Research Centre in vivo imaging, University of Liège, 4000 Liège, Belgium.,Psychology & Neuroscience of Cognition Research Unit, University of Liège, 4000 Liège, Belgium.,Fund for Scientific Research - FNRS, 1000 Brussels, Belgium
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Le HML, Faugeras L, De Moor V, Fervaille C, Vander Borght T, Collette F, D'Hondt L. Eccrine Porocarcinoma: A Challenging Diagnostic and Therapeutic Tumoral Entity. Case Rep Oncol 2021; 14:700-705. [PMID: 34177519 PMCID: PMC8215959 DOI: 10.1159/000514984] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 02/02/2021] [Indexed: 11/30/2022] Open
Abstract
Eccrine porocarcinoma is a rare malignant cutaneous tumor with high rates of extracutaneous spread, and its diagnosis and management can be quite challenging. This is a case of an 82-year-old woman presenting with an asymptomatic and chronic pubic skin lesion for whom the work-up required many investigations and procedures to confirm the diagnosis of metastatic eccrine porocarcinoma. Indeed, the patient underwent a wide local excision of the skin lesion, imaging with an FDG-PET scan, a colonoscopy, and two inguinal node dissections. As illustrated in this case, surgery should always be considered to achieve disease remission. Other treatments such as chemotherapy and radiotherapy have also been reported in the literature without clear standard guidelines.
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Affiliation(s)
- Ha Mo Linh Le
- Department of Oncology, CHU UCL Namur - Site Godinne, Yvoir, Belgium
| | - Laurence Faugeras
- Department of Oncology, CHU UCL Namur - Site Godinne, Yvoir, Belgium
| | - Véronique De Moor
- Department of General Surgery, CHU UCL Namur - Site Godinne, Yvoir, Belgium
| | | | | | - Fanny Collette
- Department of Oncology, CHU UCL Namur - Site Godinne, Yvoir, Belgium
| | - Lionel D'Hondt
- Department of Oncology, CHU UCL Namur - Site Godinne, Yvoir, Belgium
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Collette F, Hamoir M, Van Eeckhout P, D’Abadie P, Duprez T, Schmitz S, Machiels J. Metastatic cutaneous apocrine adenocarcinoma successfully treated with systemic anti-androgen therapy-A case report. Clin Case Rep 2020; 8:3472-3478. [PMID: 33363954 PMCID: PMC7752452 DOI: 10.1002/ccr3.3434] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 06/17/2020] [Accepted: 10/01/2020] [Indexed: 11/24/2022] Open
Abstract
Primary cutaneous apocrine adenocarcinoma (PCAC) is an extremely rare neoplasm involving the sweat glands. Due to a lack of cases, there is no consensus for the systemic treatment of locally advanced or metastatic PCAC. Anti-androgen therapy may have activity in inoperable or metastatic PCAC with high androgen receptor (AR) expression.
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Affiliation(s)
- Fanny Collette
- Institut Roi Albert IIDepartment of Medical OncologyCliniques universitaires Saint‐Luc and Institut de Recherche Clinique et Expérimentale (POLE MIRO)Université catholique de LouvainBrusselsBelgium
| | - Marc Hamoir
- Institut Roi Albert IIDepartment of Head and Neck SurgeryCliniques universitaires Saint‐Luc and Institut de Recherche Clinique et Expérimentale (POLE MIRO)Université catholique de LouvainBrusselsBelgium
| | - Pascal Van Eeckhout
- Institut Roi Albert IIDepartment of PathologyCliniques universitaires Saint‐LucBrusselsBelgium
| | - Philippe D’Abadie
- Institut Roi Albert IIDepartment of Nuclear MedicineCliniques universitaires Saint‐Luc and Institut de Recherche Clinique et Expérimentale (POLE MIRO)Université catholique de LouvainBrusselsBelgium
| | - Thierry Duprez
- Institut Roi Albert IIDepartment of Medical ImagingCliniques universitaires Saint‐LucBrusselsBelgium
| | - Sandra Schmitz
- Institut Roi Albert IIDepartment of Head and Neck SurgeryCliniques universitaires Saint‐Luc and Institut de Recherche Clinique et Expérimentale (POLE MIRO)Université catholique de LouvainBrusselsBelgium
| | - Jean‐Pascal Machiels
- Institut Roi Albert IIDepartment of Medical OncologyCliniques universitaires Saint‐Luc and Institut de Recherche Clinique et Expérimentale (POLE MIRO)Université catholique de LouvainBrusselsBelgium
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Schmidt C, Xhrouet M, Hamacher M, Delloye E, LeGoff C, Cavalier E, Collette F, Vandewalle G. Light exposure via head-mounted devices suppresses melatonin and improves vigilant attention without affecting cortisol and comfort. Sleep Med 2017. [DOI: 10.1016/j.sleep.2017.11.986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Muto V, Jaspar M, Meyer C, Kusse C, Chellappa SL, Degueldre C, Balteau E, Shaffii-Le Bourdiec A, Luxen A, Middleton B, Archer SN, Phillips C, Collette F, Vandewalle G, Dijk DJ, Maquet P. Local modulation of human brain responses by circadian rhythmicity and sleep debt. Science 2016; 353:687-90. [DOI: 10.1126/science.aad2993] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 06/20/2016] [Indexed: 01/21/2023]
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Jedidi H, Daury N, Capa R, Bahri MA, Collette F, Feyers D, Bastin C, Maquet P, Salmon E. Brain Metabolic Dysfunction in Capgras Delusion During Alzheimer's Disease: A Positron Emission Tomography Study. Am J Alzheimers Dis Other Demen 2015; 30:699-706. [PMID: 23813791 PMCID: PMC10852786 DOI: 10.1177/1533317513495105] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Capgras delusion is characterized by the misidentification of people and by the delusional belief that the misidentified persons have been replaced by impostors, generally perceived as persecutors. Since little is known regarding the neural correlates of Capgras syndrome, the cerebral metabolic pattern of a patient with probable Alzheimer's disease (AD) and Capgras syndrome was compared with those of 24-healthy elderly participants and 26 patients with AD without delusional syndrome. Comparing the healthy group with the AD group, the patient with AD had significant hypometabolism in frontal and posterior midline structures. In the light of current neural models of face perception, our patients with Capgras syndrome may be related to impaired recognition of a familiar face, subserved by the posterior cingulate/precuneus cortex, and impaired reflection about personally relevant knowledge related to a face, subserved by the dorsomedial prefrontal cortex.
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Affiliation(s)
- H Jedidi
- Université de Liège, Centre de Recherches du Cyclotron, Liège, Belgium Département des sciences cliniques, Neuroimagerie des troubles de la mémoire et de la revalidation cognitive, Université de Liège, Liège, Belgium
| | - N Daury
- Département de Psychologie: cognition et comportement, Université de Liège, Liège, Belgium
| | - R Capa
- Département de Psychologie: cognition et comportement, Université de Liège, Liège, Belgium
| | - M A Bahri
- Université de Liège, Centre de Recherches du Cyclotron, Liège, Belgium
| | - F Collette
- Université de Liège, Centre de Recherches du Cyclotron, Liège, Belgium Département de Psychologie: cognition et comportement, Université de Liège, Liège, Belgium
| | - D Feyers
- Université de Liège, Centre de Recherches du Cyclotron, Liège, Belgium
| | - C Bastin
- Université de Liège, Centre de Recherches du Cyclotron, Liège, Belgium Département des sciences cliniques, Neuroimagerie des troubles de la mémoire et de la revalidation cognitive, Université de Liège, Liège, Belgium
| | - P Maquet
- Université de Liège, Centre de Recherches du Cyclotron, Liège, Belgium
| | - E Salmon
- Université de Liège, Centre de Recherches du Cyclotron, Liège, Belgium Département des sciences cliniques, Neuroimagerie des troubles de la mémoire et de la revalidation cognitive, Université de Liège, Liège, Belgium
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Collette F, Salmon E. [The effect of normal and pathological aging on cognition]. Rev Med Liege 2014; 69:265-269. [PMID: 25065230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Cognitive deficits in the executive and memory domains are observed in normal aging and Alzheimer's disease (AD). These deficits are associated with changes at the brain activity level. However, a series of factors are prone to delay the occurrence of cognitive deficits, such as mental stimulation or physical activity. Similarly, cognitive rehabilitation allows improving the daily life functioning of patients with AD. The identification of factors and techniques that contribute to maintain cognitive efficiency and/or counteract the effects of AD will allow optimizing quality of life of older people.
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Naudy S, Collette F, Thominette F, Gebel G, Espuche E. Influence of hygrothermal aging on the gas and water transport properties of Nafion® membranes. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2013.10.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Genon S, Collette F, Mouli C, Leke F, Salmon E, Bastin C. P2a-8 Intérêt des biomarqueurs du LCR pour le diagnostic positif de la maladie d’Alzheimer en pratique clinique de routine. Rev Neurol (Paris) 2009. [DOI: 10.1016/s0035-3787(09)72636-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Schmidt C, Peigneux P, Leclercq Y, Sterpenich V, Vandewalle G, Berthomier P, Berthomier C, Philipps C, Tinguely G, Gais S, Schabus M, Balteau E, Luxen A, Maquet P, Cajochen C, Collette F. Stroop-related cerebral activity is modulated by time of day and chronotype. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)72082-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Schmidt C, Collette F, Leclercq Y, Sterpenich V, Vandewalle G, Berthomier P, Berthomier C, Phillips C, Tinguely G, Darsaud A, Gais S, Schabus M, Desseilles M, Dang-Vu TT, Salmon E, Balteau E, Degueldre C, Luxen A, Maquet P, Cajochen C, Peigneux P. Homeostatic Sleep Pressure and Responses to Sustained Attention in the Suprachiasmatic Area. Science 2009; 324:516-9. [DOI: 10.1126/science.1167337] [Citation(s) in RCA: 146] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Salmon E, Lekeu F, Garraux G, Guillaume B, Magis D, Luxen A, Moonen G, Collette F. Metabolic correlates of clinical heterogeneity in questionable Alzheimer's disease. Neurobiol Aging 2008; 29:1823-9. [PMID: 17543421 DOI: 10.1016/j.neurobiolaging.2007.04.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2006] [Revised: 03/25/2007] [Accepted: 04/25/2007] [Indexed: 11/19/2022]
Abstract
Thirty-four subjects with questionable Alzheimer's disease (QAD) were included in a 3-year prospective study and underwent neuropsychological testing and measurement of brain metabolism using FDG-PET at entry. Seventeen patients (50%) did not convert to AD during the follow-up period. Compared to elderly controls of similar age, the cerebral activity of non-converters was reduced in the dorsolateral prefrontal cortex. Moreover, the variability of metabolism in the posterior cingulate cortex was related to their visuospatial memory performance, while disparity in parietal activity was related to their verbal memory performance. These results demonstrate the cerebral metabolic heterogeneity of patients with QAD. Initial functional images of converters showed that activity was already impaired in the posterior cingulate, lateral temporal cortex, anterior cingulate and orbitofrontal cortex. This metabolic pattern is consistent with a pre-dementia stage of AD, and highlights the fact that significant frontal metabolic involvement may be associated with impaired activity in posterior associative cortices in very early AD.
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Affiliation(s)
- Eric Salmon
- Department of Neurology, CHU Liège, 4000 Liège, Belgium.
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Salmon E, D'Argembeau A, Bastin C, Feyers D, Phillips C, Laureys S, Maquet P, Collette F. [Brain imaging of reflection on self]. Rev Med Liege 2008; 63:458-460. [PMID: 18669220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Precise brain regions are activated when a subject gives a judgment on himself. Those are the medial parietal cortex, essentially related to episodic memory processing, and the ventromedial prefrontal cortex, recruited for evaluating the personal valence of an information. These regions are not activated in Alzheimer's disease. The decrease of awareness for own deficits in a patient with Alzheimer's disease would depend on a reduction of episodic memory capacities and a worsening of judgment for self significance.
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Affiliation(s)
- E Salmon
- Service de Neurologie, CHU Sart Tilman, Liège, Belgique
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Salmon E, Perani D, Collette F, Feyers D, Kalbe E, Holthoff V, Sorbi S, Herholz K. A comparison of unawareness in frontotemporal dementia and Alzheimer's disease. J Neurol Neurosurg Psychiatry 2008; 79:176-9. [PMID: 17898032 DOI: 10.1136/jnnp.2007.122853] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Loss of insight is a core diagnostic feature of frontotemporal dementia (FTD) and anosognosia is frequently reported in Alzheimer's disease (AD). AIM To compare unawareness (anosognosia) for different symptoms, measured with a discrepancy score between patient's and caregiver's assessment, in AD and FTD. METHOD In a prospective, multi-centre study, 123 patients with probable AD, selected according to the NINCDS-ADRDA procedure, were matched for age, sex, education, disease duration and dementia severity to patients with FTD (n = 41), selected according to international consensus criteria. A research complaint questionnaire was used to obtained patient's and caregiver's assessment concerning neuropsychological and behavioural symptoms. Data were compared in each group and between groups. Unawareness (measured by discrepancy scores) was compared between patients with AD and FTD. RESULTS The caregivers generally assessed symptoms more severely than did patients, but both patient groups reported changes in affect (depressive mood or irritability) as their caregivers did. Unawareness was greater in patients with FTD than in patients with AD for language and executive difficulties, and for changes in behaviour and daily activities. CONCLUSION The main finding is that unawareness was observed in both patients with FTD and patients with AD for most clinical domains. However, qualitative and quantitative differences showed that lack of awareness was greater in patients with FTD.
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Affiliation(s)
- E Salmon
- Cyclotron Research Center, University of Liège, B30 Sart Tilman, 4000 Liège, Belgium.
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Delbeuck X, Collette F, Van der Linden M. Is Alzheimer's disease a disconnection syndrome? Neuropsychologia 2007; 45:3315-23. [PMID: 17765932 DOI: 10.1016/j.neuropsychologia.2007.05.001] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2006] [Revised: 04/19/2007] [Accepted: 05/03/2007] [Indexed: 11/28/2022]
Abstract
In Alzheimer's disease (AD), loss of connectivity in the patient's brain has been evidenced by a range of electrophysiological and neuroimaging studies. However, few neuropsychological research projects have sought to interpret the cognitive modifications following the appearance of AD in terms of a disconnection syndrome. In this paper, we sought to investigate brain connectivity in AD via the study of a crossmodal effect. More precisely, we examined the integration of auditory and visual speech information (the McGurk effect) in AD patients and matched control subjects. Our results revealed impaired crossmodal integration during speech perception in AD, which was not associated with disturbances in the separate processing of auditory and visual speech stimuli. In conclusion, our data suggest the occurrence of a specific, audio-visual integration deficit in AD, which might be the consequence of a connectivity breakdown and corroborate the observation from other studies of crossmodal deficits between the auditory and visual modalities in this population.
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Affiliation(s)
- X Delbeuck
- Memory, Resources & Research Centre, EA 2691, Lille University Hospital, Lille, France.
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Majerus S, Poncelet M, Van der Linden M, Albouy G, Salmon E, Sterpenich V, Vandewalle G, Collette F, Maquet P. The left intraparietal sulcus and verbal short-term memory: focus of attention or serial order? Neuroimage 2006; 32:880-91. [PMID: 16702002 DOI: 10.1016/j.neuroimage.2006.03.048] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2005] [Revised: 03/05/2006] [Accepted: 03/26/2006] [Indexed: 11/21/2022] Open
Abstract
One of the most consistently activated regions during verbal short-term memory (STM) tasks is the left intraparietal sulcus (IPS). However, its precise role remains a matter of debate. While some authors consider the IPS to be a specific store for serial order information, other data suggest that it serves a more general function of attentional focalization. In the current fMRI experiment, we investigated these two hypotheses by presenting different verbal STM conditions that probed recognition for word identity or word order and by assessing functional connectivity of the left IPS with distant brain areas. If the IPS has a role of attentional focalization, then it should be involved in both order and item conditions, but it should be connected to different brain regions, depending on the neural substrates involved in processing the different types of information (order versus phonological/orthographic) to be remembered in the item and order STM conditions. We observed that the left IPS was activated in both order and item STM conditions but for different reasons: during order STM, the left IPS was functionally connected to serial/temporal order processing areas in the right IPS, premotor and cerebellar cortices, while during item STM, the left IPS was connected to phonological and orthographic processing areas in the superior temporal and fusiform gyri. Our data support a position considering that the left IPS acts as an attentional modulator of distant neural networks which themselves are specialized in processing order or language representations. More generally, they strengthen attention-based accounts of verbal STM.
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Affiliation(s)
- S Majerus
- Department of Cognitive Sciences and Experimental Psychology and Cognitive Neuroscience Research Unit, University of Liège, Belgium.
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Collette F, Hogge M, Salmon E, Van der Linden M. Exploration of the neural substrates of executive functioning by functional neuroimaging. Neuroscience 2006; 139:209-21. [PMID: 16324796 DOI: 10.1016/j.neuroscience.2005.05.035] [Citation(s) in RCA: 272] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2005] [Revised: 05/09/2005] [Accepted: 05/27/2005] [Indexed: 10/25/2022]
Abstract
This review presents neuroimaging studies that have explored the cerebral substrates of executive functioning. These studies have demonstrated that different executive functions not only recruit various frontal areas but also depend upon posterior (mainly parietal) regions. These results are in accordance with the hypothesis that executive functioning relies on a distributed cerebral network that is not restricted to anterior cerebral areas. However, there exists an important heterogeneity in the cerebral areas associated with these different processes, and also between different tasks assessing the same process. Since these discrepant results could be due to the paradigms used (subtraction designs), recent results obtained with conjunction and interaction analyses are presented, which confirm the role of parietal areas in executive functioning and also demonstrate the existence of some specificity in the neural substrates of the executive processes of updating, shifting and inhibition. Finally, functional magnetic resonance imaging studies show that the activity in cerebral areas involved in executive tasks can be transient or sustained. Consequently, to better characterize the functional role of areas associated with executive functioning, it is important to take into account not only the localization of cerebral activity but also the temporal pattern of this activity.
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Affiliation(s)
- F Collette
- Department of Neuropsychology, University of Liège, Boulevard du Rectorat 3 (B33), B-4000 Liège (Sart Tilman), Belgium.
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Collette F, Adam S, Hogge M, Salmon E. O3-1 Exploration des processus inhibiteurs dans le vieillissement normal et la maladie d’Alzheimer. Rev Neurol (Paris) 2005. [DOI: 10.1016/s0035-3787(05)85303-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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23
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Salmon E, Collette F. Functional imaging of executive functions. Acta Neurol Belg 2005; 105:187-96. [PMID: 16482867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Executive functioning refers to cognitive processes that facilitate our adaptation to new or complex situations when action routines are not efficient. Neuropsychological studies in brain-damaged patients suggested that executive functions were predominantly dependent on prefrontal regions. However, prefrontal lesions frequently occurred in a context of more widespread brain involvement, and a dysexecutive syndrome was described in posterior cortical dementia of the Alzheimer type. Functional imaging can precisely identify brain networks involved in executive functioning. We discuss functional imaging studies that show both frontal and posterior activation during executive tasks and bring information concerning unity and diversity in executive processes.
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Affiliation(s)
- E Salmon
- Cyclotron Research Centre, University of Liège, Belgium
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Salmon* E, Lespagnard* S, Marique P, Peeters F, Herholz K, Perani D, Holthoff V, Kalbe E, Anchisi D, Adam S, Collette F, Garraux G. Cerebral metabolic correlates of four dementia scales in Alzheimer’s disease. J Neurol 2005. [DOI: 10.1007/s00415-005-0961-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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25
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Salmon E, Lespagnard S, Marique P, Peeters F, Herholz K, Perani D, Holthoff V, Kalbe E, Anchisi D, Adam S, Collette F, Garraux G. Cerebral metabolic correlates of four dementia scales in Alzheimer's disease. J Neurol 2005; 252:283-90. [PMID: 16189724 DOI: 10.1007/s00415-005-0551-3] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2003] [Revised: 03/09/2004] [Accepted: 05/10/2004] [Indexed: 10/25/2022]
Abstract
Different scales can be used to evaluate dementia severity in Alzheimer's disease (AD). They do assess different cognitive or functional abilities, but their global scores are frequently in mutual correlation. Functional imaging provides an objective method for the staging of dementia severity. Positron emission tomography was used to assess the relationship between brain metabolism and four dementia scales that reflect a patient's global cognitive abilities (mini mental state), caregiver's evaluation of cognitive impairment (newly designed scale), daily living functioning (instrumental activities of daily living) and global dementia (clinical dementia rating). We wondered whether different clinical dementia scales would be related to severity of metabolic impairment in the same brain regions, and might reflect impairment of common cognitive processes. 225 patients with probable AD were recruited in a prospective multicentre European study. All clinical scales were related to brain metabolism in associative temporal, parietal or frontal areas. A factorial analysis demonstrated that all scales could be classified in a single factor. That factor was highly correlated to decrease of cerebral activity in bilateral parietal and temporal cortices, precuneus, and left middle frontal gyrus. This finding suggests that global scores for all scales provided similar information on the neural substrate of dementia severity. Capitalizing on the neuroimaging literature, dementia severity reflected by reduced metabolism in posterior and frontal associative areas in AD might be related to a decrease of controlled processes.
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Affiliation(s)
- E Salmon
- Cyclotron Research Centre, University of Liege, B30 Sart Tilman, 4000 Liege, Belgium.
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Abstract
This paper reviews the growing amount of evidence supporting the hypothesis that Alzheimer's disease includes a disconnection syndrome. This evidence came mainly from neuropathological, electrophysiological, and neuroimaging studies. Moreover, a few recent neuropsychological studies have also explored the effects of a disconnection between cerebral areas on cognitive functioning. Finally, and more generally, the contribution of this interpretation to the understanding of Alzheimer's disease cognitive deficits is considered.
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Affiliation(s)
- X Delbeuck
- Cognitive Psychopathology Unit, University of Geneva, Geneva, Switzerland.
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Majerus S, Collette F, Van der Linden M, Peigneux P, Laureys S, Delfiore G, Degueldre C, Luxen A, Salmon E. A PET investigation of lexicality and phonotactic frequency in oral language processing. Cogn Neuropsychol 2002; 19:343-61. [DOI: 10.1080/02643290143000213] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Lekeu F, Marczewski P, Van der Linden M, Collette F, Degueldre C, Del Fiore G, Luxen A, Franck G, Moonen G, Salmon E. Effects of incidental and intentional feature binding on recognition: a behavioural and PET activation study. Neuropsychologia 2002; 40:131-44. [PMID: 11640936 DOI: 10.1016/s0028-3932(01)00088-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Using Positron Emission Tomography (PET), we investigated cerebral regions associated with the episodic recognition of words alone and words bound to contextual colours. Two modes of colour encoding were tested: incidental and intentional word-to-colour binding. Word-only recognition was associated with brain activation in a lexico-semantic left middle temporal region and in the cerebellum following an incidental colour encoding, and with brain activation in the left posterior middle frontal gyrus, right anterior cingulate and right inferior frontal gyrus following an intentional encoding. Recognition of bound features was associated with activation in left prefrontal and superior parietal regions following an incidental colour encoding, and with preferential right prefrontal cortex activation following an intentional colour encoding. Our results are in line with the hypothesis of a parietal involvement in context processing, and prefrontal areas in monitoring retrieval processes. Our results also support the hypothesis of a 'cortical asymmetry for reflective activity' (CARA).
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Affiliation(s)
- F Lekeu
- Centre de Recherches du Cyclotron, 8 Allée du 6 Août-B 30, University of Liège, Sart-Tilman, B-4000, Liège, Belgium.
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Collette F, Van der Linden M, Delfiore G, Degueldre C, Luxen A, Salmon E. The functional anatomy of inhibition processes investigated with the Hayling task. Neuroimage 2001; 14:258-67. [PMID: 11467901 DOI: 10.1006/nimg.2001.0846] [Citation(s) in RCA: 109] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The cortical areas involved in inhibition processes were examined with positron emission tomography (PET). The tasks administered to subjects were an adaptation of the Hayling test. In the first condition (response initiation), subjects had to complete sentences with a word clearly suggested by the context, whereas in the second condition (response inhibition), subjects had to produce a word that made no sense in the context of the sentence. Results indicated that the response initiation processes were associated to increases of activity in the left inferior frontal gyrus (BA 45/47), whereas response inhibition processes led to increases in a network of left prefrontal areas, including the middle (BA 9 and BA 10) and inferior (BA 45) frontal areas.
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Affiliation(s)
- F Collette
- Department of Neuropsychology, University of Liège, Belgium
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Collette F, Van der Linden M, Dabe P, Degueldre C, Delfiore G, Luxen A, Salmon E. Contribution of lexico-semantic processes to verbal short-term memory tasks: a PET activation study. Memory 2001; 9:249-59. [PMID: 11594350 DOI: 10.1080/09658210143000056] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Recent studies have demonstrated the intervention of long-term memory processes in verbal STM tasks and several cognitive models have been proposed to explain these effects. A PET study was performed in order to determine whether supplementary cerebral areas are involved when subjects have to execute short-term memory tasks for items having representations in long-term memory (in comparison to items without such representations: words vs non-words). Results indicate that verbal STM for words specifically involves the left middle temporal gyrus (BA 21) and temporo-parietal junction (BA 39). These areas can be associated with lexical and semantic processes. These results are in agreement with cognitive models that postulate the simultaneous influence of lexical and semantic long-term representations on verbal STM processes and/or a lexico-semantic buffer.
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Toussaint O, Baret PV, Brion JP, Cras P, Collette F, De Deyn PP, Geenen V, Kienlen-Campard P, Labeur C, Legros JJ, Nève J, Octave JN, Piérard GE, Salmon E, van den Bosch de Aguilar P P, Van der Linden M, Leuven FV, Vanfleteren J. Experimental gerontology in Belgium: from model organisms to age-related pathologies. Exp Gerontol 2000; 35:901-16. [PMID: 11121679 DOI: 10.1016/s0531-5565(00)00177-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- O Toussaint
- Unit of Cellular Biochemistry, University of Namur, Rue de Bruxelles, 61, B-5000 Namur, Belgium.
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Abstract
The aim of the study was to emphasize cerebral regions which subserve the performance of short-term memory tasks in patients with Alzheimer's disease. We correlated scores obtained on span tasks with cerebral metabolism measured at rest with positron emission tomography. Scores obtained on the digit span task correlated with glucose metabolism in a brain area centered on the premotor cortex and extending to the adjacent motor and parietal gyri. There exists some evidence suggesting that this area may subserve the sequential organization of material stored in short-term memory. In a secondary analysis, we also observed significant interregional correlations between left-sided brain areas which are part of the neural network subserving verbal working memory processes in healthy controls. These data suggest that individual performance on verbal span tasks in AD patients may essentially depend on the preservation of their ordination processing capacity. The absence of correlation with prefrontal regions suggests that AD patients might not spontaneously engage central executive resources to reach their maximal span score. For simultaneous visuospatial span task, the performance of patients correlated with posterior brain regions, and not with prefrontal cortices.
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Affiliation(s)
- F Collette
- Department of Neuropsychology, Cyclotron Research Centre, University of Liege, Belgium
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33
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Collette F, Van der Linden M. [Working memory: a neuropsychologic and cerebral imagery approach]. Therapie 2000; 55:455-60. [PMID: 11098721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
The working memory model proposed by Baddeley and Hitch has frequently been used in cognitive psychology and neuropsychological studies. This model consists of several interacting components, responsible for the storage and processing of the information stored in working memory. Many neuropsychological and functional imagery data are consistent with that formulation of working memory. Moreover, many cognitive tasks have been specifically designed to explore particular aspects of working memory functioning. Taken as a whole, these data confirm that the working memory model remains a useful theoretical framework to explore memory functioning both in normal subjects and in pathological conditions.
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Affiliation(s)
- F Collette
- Service de Neuropsychologie, Université de Liège, Belgique
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Salmon E, Collette F, Degueldre C, Lemaire C, Franck G. Voxel-based analysis of confounding effects of age and dementia severity on cerebral metabolism in Alzheimer's disease. Hum Brain Mapp 2000. [PMID: 10843517 DOI: 10.1002/(sici)1097-0193(200005)10:1<39::aid-hbm50>3.0.co;2-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023] Open
Abstract
Alzheimer's disease is characterized by early hippocampal lesions, but neuropathological and functional imaging studies have also demonstrated involvement of associative cortices in patients suffering from this illness. New image-processing technologies have led to demonstration of predominant posteromedial cortical metabolic impairment in the disease. Confounding effects of both age and dementia severity on brain metabolism were assessed using categorical and correlational analyses performed with Statistical Parametric Mapping. Posterior cingulate and precuneus metabolism, assessed by positron emission tomography, was significantly correlated with age in a population of 46 patients with probable Alzheimer's disease. Metabolism in posterior cingulate and precuneus was higher in elderly than in younger patients with a diagnosis of Alzheimer's disease, even when dementia severity was taken as a confounding covariate. The data suggest that the sensitivity of positron emission tomography for the diagnosis of Alzheimer's disease is reduced in elderly cases, where less severe pathology is sufficient to induce clinical symptoms of dementia. Conversely, higher posteromedial metabolic impairment in early onset cases may reflect greater density of regional cerebral lesions or major decrease of functional afferences in a richly connected multimodal associative area. Posterior cingulate metabolism was also correlated to dementia severity, even when age was taken as a confounding covariate, whereas metabolism in the hippocampal formation was not shown to correlate with global cognitive deficit. Functional correlation was maintained between posterior cingulate and middle frontal cortex in demented patients as in elderly controls. The key role of posteromedial cortex in cognitive dysfunction assessed in Alzheimer's disease is probably related to its highly integrated position within attentional, visuospatial and memory neuronal networks.
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Affiliation(s)
- E Salmon
- Department of Neurology, University of Liege, Belgium.
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35
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Abstract
Alzheimer's disease is characterized by early hippocampal lesions, but neuropathological and functional imaging studies have also demonstrated involvement of associative cortices in patients suffering from this illness. New image-processing technologies have led to demonstration of predominant posteromedial cortical metabolic impairment in the disease. Confounding effects of both age and dementia severity on brain metabolism were assessed using categorical and correlational analyses performed with Statistical Parametric Mapping. Posterior cingulate and precuneus metabolism, assessed by positron emission tomography, was significantly correlated with age in a population of 46 patients with probable Alzheimer's disease. Metabolism in posterior cingulate and precuneus was higher in elderly than in younger patients with a diagnosis of Alzheimer's disease, even when dementia severity was taken as a confounding covariate. The data suggest that the sensitivity of positron emission tomography for the diagnosis of Alzheimer's disease is reduced in elderly cases, where less severe pathology is sufficient to induce clinical symptoms of dementia. Conversely, higher posteromedial metabolic impairment in early onset cases may reflect greater density of regional cerebral lesions or major decrease of functional afferences in a richly connected multimodal associative area. Posterior cingulate metabolism was also correlated to dementia severity, even when age was taken as a confounding covariate, whereas metabolism in the hippocampal formation was not shown to correlate with global cognitive deficit. Functional correlation was maintained between posterior cingulate and middle frontal cortex in demented patients as in elderly controls. The key role of posteromedial cortex in cognitive dysfunction assessed in Alzheimer's disease is probably related to its highly integrated position within attentional, visuospatial and memory neuronal networks.
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Affiliation(s)
- E Salmon
- Department of Neurology, University of Liege, Belgium.
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36
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Collette F, Van der Linden M, Poncelet M. Working memory, long-term memory, and language processing: issues and future directions. Brain Lang 2000; 71:46-51. [PMID: 10716804 DOI: 10.1006/brln.1999.2209] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Affiliation(s)
- F Collette
- Neuropsychology Unit, University of Liège, Liège, Belgium.
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Herholz K, Nordberg A, Salmon E, Perani D, Kessler J, Mielke R, Halber M, Jelic V, Almkvist O, Collette F, Alberoni M, Kennedy A, Hasselbalch S, Fazio F, Heiss WD. Impairment of neocortical metabolism predicts progression in Alzheimer's disease. Dement Geriatr Cogn Disord 1999; 10:494-504. [PMID: 10559566 DOI: 10.1159/000017196] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Progression rates of Alzheimer's disease (AD) vary considerably, and they are particularly difficult to predict in patients with mild cognitive impairment. We performed a prospective multicenter cohort study in 186 patients with possible or probable AD, mostly with presenile onset. In a cross-sectional analysis at entry, impairment of glucose metabolism in temporoparietal or frontal association areas measured with positron emission tomography was significantly associated with dementia severity, clinical classification as possible versus probable AD, presence of multiple cognitive deficits and history of progression. A prospective longitudinal analysis showed a significant association between initial metabolic impairment and subsequent clinical deterioration. In patients with mild cognitive deficits at entry, the risk of deterioration was up to 4.7 times higher if the metabolism was severely impaired than with mild or absent metabolic impairment. Copyrightz1999S.KargerAG, Basel
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Affiliation(s)
- K Herholz
- Max-Planck-Institut für neurologische Forschung, Köln, Germany.
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Van der Linden M, Collette F, Salmon E, Delfiore G, Degueldre C, Luxen A, Franck G. The neural correlates of updating information in verbal working memory. Memory 1999; 7:549-60. [PMID: 10659086 DOI: 10.1080/096582199387742] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The aim of the present study was to re-examine cerebral areas subserving the updating function of the central executive with a running span task requiring subjects to watch strings of consonants of unknown length and then to recall serially a specific number of recent items. In order to dissociate more precisely the updating process from the storage function, a four-item instead of a six-item memory load was used, contrary to our previous study (Salmon et al., 1996). In addition, a serial recall procedure was preferred to a recognition procedure in order to suppress the use of visuospatial strategies. The most significant increase of rCBF occurred in the left frontopolar cortex (Brodmann's area 10), spreading to the left middle frontal (Brodmann's area 46). Results suggest that frontopolar activation underlies an updating process in working memory.
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Abstract
The phonological loop and central executive functioning were examined in patients with Alzheimer's disease (AD) and in normal elderly subjects. AD patients showed abnormal functioning of the phonological loop and decreased performance on tasks assessing the central executive. However, when AD patients were separated into two groups on the basis of their span level, both groups showed deficits of the central executive but only patients with the lower span level presented a dysfunction of the phonological loop as well as impaired performance in tasks of phonological discrimination, articulation rate and speed of processing. These results are interpreted in terms of progression of the disease, with high-span level patients being less severely demented and displaying deficits only in higher-level cognitive functions (such as manipulation of information stored in working memory) whereas patients with a low span level have impairments encompassing a series of more basic processes.
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Affiliation(s)
- F Collette
- Neuropsychology Unit, University of Liège, Belgium.
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Abstract
Executive functioning was examined in 20 patients with Alzheimer's disease (AD) and 20 normal elderly subjects. The results showed that AD patients present lower performance compared to control subjects in all executive tasks, confirming that some executive deficits may be present in the first stages of the disease. A factorial analysis suggested that these deficits can be related to two domains of the executive functions: the inhibition abilities and the capacity to co-ordinate simultaneously storage and processing of information. Moreover, the performance on these factors is correlated to different anterior and posterior cortical areas.
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Affiliation(s)
- F Collette
- Neuropsychology Unit, University of Liège, Belgium.
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Collette F, Salmon E, Van der Linden M, Chicherio C, Belleville S, Degueldre C, Delfiore G, Franck G. Regional brain activity during tasks devoted to the central executive of working memory. Brain Res Cogn Brain Res 1999; 7:411-7. [PMID: 9838207 DOI: 10.1016/s0926-6410(98)00045-7] [Citation(s) in RCA: 111] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Most previous PET studies investigating the central executive (CE) component of working memory found activation in the prefrontal cortex. However, the tasks used did not always permit to distinguish precisely the functions of the CE from the storage function of the slave systems. The aim of the present study was to isolate brain areas that subserve manipulation of information by the CE when the influence of storage function was removed. A PET activation study was performed with four cognitive tasks, crossing conditions of temporary storage and manipulation of information. The manipulation of information induced an activation in the right (BA 10/46) and left (BA 9/6) middle frontal gyrus and in the left parietal area (BA7). The interaction between the storage and manipulation conditions did not reveal any significant changes in activation. These results are in agreement with the hypothesis that CE functions are distributed between anterior and posterior brain areas, but could also reflect a simultaneous involvement of controlled (frontal) and automatic (parietal) attentional systems. In the other hand, the absence of interaction between the storage and manipulation conditions demonstrates that the CE is not necessarily related to the presence of a memory load.
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Affiliation(s)
- F Collette
- Neuropsychology Unit, University of Liège, Liège, Belgium.
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42
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Salmon E, George M, Collette F. [Alzheimer's disease]. Rev Med Liege 1997; 52:258-61. [PMID: 9273618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- E Salmon
- Service de Neurologie, Université de Liège
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Salmon E, Van der Linden M, Collette F, Delfiore G, Maquet P, Degueldre C, Luxen A, Franck G. Regional brain activity during working memory tasks. Brain 1996; 119 ( Pt 5):1617-25. [PMID: 8931584 DOI: 10.1093/brain/119.5.1617] [Citation(s) in RCA: 242] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The first aim of our PET study was to replicate previous findings concerning the brain areas activated by a verbal working memory task. The second aim was to specify the neural basis of the central executive, using a task of working memory updating. Our data confirm that the lower left supramarginal gyrus and premotor area are the key regions subserving short-term verbal memory processes. They also suggest that the updating memory task is related to middorsolateral prefrontal activation, most probably responsible for the updating function of the central executive. An unexpected, predominantly right activation occurred in the inferior parietal region during the verbal memory updating task, which we related to a visuospatial strategy used to maintain the information in short-term memory. A third purpose was to explore the brain regions activated by a nonverbal, visual memory task, and our results confirm the importance of the superior occipital gyrus in the visual short-term memory.
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Affiliation(s)
- E Salmon
- Cyclotron Research Centre, University of Liège, Belgium
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Salmon E, Van der Linden M, Garraux G, Collette F, Demoulin V, George M, Franck G. [Metabolic, cerebral and neuropsychological characterization of Parkinson syndromes]. Rev Med Liege 1996; 51:566-570. [PMID: 8966402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Affiliation(s)
- E Salmon
- Université de Liège, Centre de Recherches du Cyclotron
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