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Dynamic Retinotopy using MEG: structural, temporal and functional components investigated with frequency tagging| old_uid | 9285 |
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| title | Dynamic Retinotopy using MEG: structural, temporal and functional components investigated with frequency tagging |
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| start_date | 2010/11/22 |
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| schedule | 11h30 |
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| online | no |
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| location_info | Bibliothèque Inserm U821 |
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| details | J.G. Dornbierer, J. Lorenceau |
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| summary | fMRI provides accurate spatial information on cortical organization, but is "blind" to the fine temporal structure of neural activities that can provide important information about perceptual processing. Using frequency-tagged steady-state visual stimulation with a combination of time-resolved functional magnetic source imaging from MEG and MRI, we show that mapping sustained oscillatory responses allows reasonable spatial localization while relative phase delays across visual areas provide access to accurate timing. Moreover, the distribution of phase delays reveals both smooth phase shifts and phase discontinuities suggesting that phase distributions not only carry information about the chronometry of neural events but may also be used to characterize the transformations realized in the cascade of processes performed across visual areas. We shall present preliminary evidence that this approach may provide a powerful tool to studystructural, temporal and functional components of neural perceptual processes. |
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| responsibles | BĂ©ranger |
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