The graphemic/motor frontal area Exner's area revisited.

Détails

ID Serval
serval:BIB_27EA01920A27
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
The graphemic/motor frontal area Exner's area revisited.
Périodique
Annals of Neurology
Auteur(s)
Roux F.E., Dufor O., Giussani C., Wamain Y., Draper L., Longcamp M., Démonet J.F.
ISSN
1531-8249 (Electronic)
ISSN-L
0364-5134
Statut éditorial
Publié
Date de publication
2009
Peer-reviewed
Oui
Volume
66
Numéro
4
Pages
537-545
Langue
anglais
Notes
Publication types: Comparative Study ; Journal ArticlePublication Status: ppublish. PDF type: Original Article
Résumé
OBJECTIVE: In 1881, Exner first described a "graphic motor image center" in the middle frontal gyrus. Current psycholinguistic models of handwriting involve the conversion of abstract, orthographic representations into motor representations before a sequence of appropriate hand movements is produced. Direct cortical stimulation and functional magnetic resonance imaging (fMRI) were used to study the human frontal areas involved in writing.
METHODS: Cortical electrical stimulation mapping was used intraoperatively in 12 patients during the removal of brain tumors to identify the areas involved in oral language (sentence reading and naming) and writing, and to spare them during surgery. The fMRI activation experiment involved 12 right-handed and 12 left-handed healthy volunteers using word dictation (without visual control) and 2 control tasks.
RESULTS: Direct cortical electrical stimulation of restricted areas rostral to the primary motor hand area (Brodmann area [BA] 6) impaired handwriting in 6 patients, without disturbing hand movements or oral language tasks. In 6 other patients, stimulation of lower frontal regions showed deficits combining handwriting with other language tasks. fMRI also revealed selective activation during word handwriting in left versus right BA6 depending on handedness. This area was anatomically matched to those areas that affected handwriting on electrical stimulation.
INTERPRETATION: An area in middle frontal gyrus (BA6) that we have termed the graphemic/motor frontal area supports bridging between orthography and motor programs specific to handwriting.
Mots-clé
Adult, Brain Mapping/methods, Electric Stimulation/methods, Female, Frontal Lobe/physiology, Handwriting, Humans, Magnetic Resonance Imaging/methods, Male, Middle Aged, Motor Cortex/physiology, Young Adult
Pubmed
Web of science
Création de la notice
24/03/2013 20:22
Dernière modification de la notice
03/03/2018 15:13
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