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Phase delays within visual cortex shape the response to steady-state visual stimulation.

Benoit Cottereau 1 Jean Lorenceau 2 Alexandre Gramfort 3, 4, 5 Maureen Clerc 6 Bertrand Thirion 3, 4 Sylvain Baillet 7
4 PARIETAL - Modelling brain structure, function and variability based on high-field MRI data
Inria Saclay - Ile de France, NEUROSPIN - Service NEUROSPIN
5 ODYSSEE - Computer and biological vision
DI-ENS - Département d'informatique de l'École normale supérieure, CRISAM - Inria Sophia Antipolis - Méditerranée , ENS Paris - École normale supérieure - Paris, Inria Paris-Rocquencourt, ENPC - École des Ponts ParisTech
6 ATHENA - Computational Imaging of the Central Nervous System
CRISAM - Inria Sophia Antipolis - Méditerranée
Abstract : Although the spatial organization of visual areas can be revealed by functional Magnetic Resonance Imaging (fMRI), the synoptic, non-invasive access to the temporal characteristics of the information flow amongst distributed visual processes remains a technical and methodological challenge. Using frequency-encoded steady-state visual stimulation together with a combination of time-resolved functional magnetic source imaging from magnetoencephalography (MEG) and anatomical magnetic resonance imaging (MRI), this study evidences maps of visuotopic sustained oscillatory neural responses distributed across the visual cortex. Our results further reveal relative phase delays across responding striate and extra-striate visual areas, which thereby shape the chronometry of neural processes amongst these regions. The methodology developed in this study points at further developments in time-resolved analyses of distributed visual processes in the millisecond range, and to new ways of exploring the dynamics of functional processes within the human visual cortex non-invasively.
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Submitted on : Wednesday, October 13, 2010 - 2:27:22 PM
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Benoit Cottereau, Jean Lorenceau, Alexandre Gramfort, Maureen Clerc, Bertrand Thirion, et al.. Phase delays within visual cortex shape the response to steady-state visual stimulation.. NeuroImage, Elsevier, 2010, 54 (3), pp.1919-1929. ⟨10.1016/j.neuroimage.2010.10.004⟩. ⟨inria-00526019⟩



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