Variabilité de l'activation hémisphérique droite lors du traitement sémantique des mots chez des patients aphasiques: étude électrophysiologique de trois cas [Variability of right hemisphere activation during semantic word processing in aphasic patients: an electrophysiologic study in three patients]

Détails

ID Serval
serval:BIB_83F1396D01CB
Type
Article: article d'un périodique ou d'un magazine.
Sous-type
Etude de cas (case report): rapporte une observation et la commente brièvement.
Collection
Publications
Titre
Variabilité de l'activation hémisphérique droite lors du traitement sémantique des mots chez des patients aphasiques: étude électrophysiologique de trois cas [Variability of right hemisphere activation during semantic word processing in aphasic patients: an electrophysiologic study in three patients]
Périodique
Revue Neurologique
Auteur(s)
Annoni J.M., Michel C.M., Landis T., Khateb A.
ISSN
0035-3787
Statut éditorial
Publié
Date de publication
2002
Peer-reviewed
Oui
Volume
158
Numéro
3
Pages
317-331
Langue
français
Notes
Case Reports English Abstract Journal Article Research Support, Non-U.S. Gov't --- Old month value: Mar
Résumé
After stroke, the interhemispheric reorganisation of the neural network implicated in language is hypothesized to be a function not only of the site of lesion but also of the residual impairment. With a multiple case approach, we tested this hypothesis in three chronic aphasic patients. Two patients, GE (capsulo-lenticular stroke) and JHN (fronto-temporal stroke) showed formal residual semantic difficulties, while the third patient (EG, large sylvian lesion) did not. Brain electric activity was analysed during a categorisation task of tachistoscopically presented words in the left and the right visual field. The temporal analysis of brain activity showed that both patients with semantic residual difficulties activated the right hemisphere (RH) during some steps of word processing. In the third patient, without semantic impairment, the RH was activated only during a short time period. Further more, RH activation was shown to be dependent on the visual field of word presentation. Phonological impairment was not predictive of RH activation. These results suggest that RH activation, particularly anterior regions, can occur during semantic processing of words as a function of semantic residual impairment.
Mots-clé
Adult, Aged, Aphasia, Articulation Disorders, Brain Mapping, Corpus Striatum, Dominance, Cerebral, Electroencephalography, Frontal Lobe, Humans, Internal Capsule, Middle Aged, Neuronal Plasticity, Semantics, Stroke, Temporal Lobe
Pubmed
Web of science
Création de la notice
25/01/2008 12:36
Dernière modification de la notice
03/03/2018 18:53
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