Imaging of a synchronous neuronal assembly in the human visual brain

Détails

ID Serval
serval:BIB_075034B914E3
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Imaging of a synchronous neuronal assembly in the human visual brain
Périodique
Neuroimage
Auteur(s)
Knyazeva  M. G., Fornari  E., Meuli  R., Innocenti  G., Maeder  P.
ISSN
1053-8119
Statut éditorial
Publié
Date de publication
01/2006
Peer-reviewed
Oui
Volume
29
Numéro
2
Pages
593-604
Notes
Research Support, Non-U.S. Gov't
Knyazeva, Maria G
Fornari, Eleonora
Meuli, Reto
Innocenti, Giorgio
Maeder, Philippe
United States
NeuroImage
Neuroimage. 2006 Jan 15;29(2):593-604. Epub 2005 Sep 22. --- Old month value: Jan 15
Résumé
Perception, motion, and cognition involve the formation of cooperative neuronal assemblies distributed over the cerebral cortex. It remains to explore what characterizes the assemblies, their location, and the structural substrate of assembly formation. In this EEG/fMRI study, we describe the response of the visual areas of the two hemispheres in subjects who viewed bilateral iso-oriented (IG) or orthogonally-oriented (OG) moving gratings projected in the two hemifields. The IG stimulus synchronized activity across the hemispheres, as shown by an increased EEG coherence. The increase was restricted to the occipital electrodes and to the beta band. Compared with OG, IG increased the BOLD signal in a restricted territory corresponding to area VP/V4. Within this territory, a linear relation was found between the increased interhemispheric EEG coherence and BOLD. Thus, the increased BOLD localized a trans-hemispheric, synchronous neuronal assembly probably achieved by a callosal cortico-cortical connection. This assembly might reflect an early stage of perceptual grouping since the IG stimulus conforms to Gestalt psychology principles of collinearity and common fate.
Mots-clé
Adult Algorithms Cerebral Cortex/cytology/*physiology Corpus Callosum/cytology/physiology Cues Electroencephalography Eye Movements/physiology Female Functional Laterality/physiology Humans Image Processing, Computer-Assisted Magnetic Resonance Imaging Male Middle Aged Neurons/*physiology Photic Stimulation Visual Cortex/cytology/physiology Visual Fields Visual Pathways/cytology/physiology Visual Perception/*physiology
Pubmed
Web of science
Création de la notice
11/04/2008 9:23
Dernière modification de la notice
03/03/2018 13:27
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