The timing of visual evoked potential activity in human area V4.

Détails

ID Serval
serval:BIB_EACADB63D759
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
The timing of visual evoked potential activity in human area V4.
Périodique
Proceedings of the Royal Society B Biological Sciences
Auteur⸱e⸱s
Buchner H., Weyen U., Frackowiak R.S., Romaya J., Zeki S.
ISSN
0962-8452 (Print)
ISSN-L
0962-8452
Statut éditorial
Publié
Date de publication
1994
Volume
257
Numéro
1348
Pages
99-104
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
Résumé
Studies of human occipital visual cortex have demonstrated functional specializations for colour and for motion, with a pivotal area for colour processing (area V4) being located in the fusiform gyrus. To study the timing of arrival of signals in area V4 we have recorded multi-channel visual evoked potentials (VEPS) to colour and grey 'Mondrian' stimuli, spatio-temporal dipole source analysis being computed on two independent group averages of five and six subjects respectively. Three active brain regions were identified, which we interpret to correspond to areas V1, V2 and V4; they showed sequential but overlapping activity in time with no difference in magnitude between colour and grey stimulated VEPs. Source analysis of the difference potentials, colour minus grey, isolated source activity resulting from colour stimulation and located it in the region of area V4. Activity in area V4 started at 100 ms and peaked at 135 ms after the onset of the visual stimulus.
Mots-clé
Adult, Brain Mapping, Color Perception, Evoked Potentials, Visual, Female, Humans, Male, Motion Perception, Paintings, Reaction Time, Visual Cortex/physiology
Pubmed
Web of science
Création de la notice
16/09/2011 20:46
Dernière modification de la notice
20/08/2019 16:13
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