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Perceptual association waves and collective belief in Visual Cortex| old_uid | 14524 |
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| title | Perceptual association waves and collective belief in Visual Cortex |
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| start_date | 2014/10/22 |
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| schedule | 11h15-12h |
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| online | no |
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| summary | Combination of intracellular recordings and network imaging (voltage sensitive dye) allows to explore binding mechanisms operating beyond the classical receptive field, in the “silent” periphery of visual cortical neurons. Using apparent motion noise at saccadic speed, we have inferred from the synaptic echoes (recorded intracellularly) the existence of long-distance propagation of visually evoked activity through lateral (and possibly feedback) connectivity outside the classical receptive field. VSD imaging has been used to visualize, at the mesoscopic level, the propagation patterns travelling at the speed inferred from our microscopic recordings. Results obtained at UNIC in collaboration with F. Gerard-Mercier, P. Carelli, M. Pananceau and more recently X. Troncoso demonstrate the propagation of intracortical depolarizing waves at the V1 map level. These waves are interpreted as broadcasting an elementary form of collective “belief” to distant parts of the network. Their functional features support the hypothesis of a dynamic perceptual association field, facilitating synaptic modulation in space and time during oculomotor exploration. They may serve as a substrate for implementing the psychological Gestalt principles of common fate and axial collinearity.
(Work supported by CNRS, the French ANR (NatStats and V1-complex) and the European Community (FE-Bio-I3 integrated programs (IP FP6: FACETS (015879), IP FP7: BRAINSCALES(269921) and Brain-i-nets (243914)).) |
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| responsibles | Petitot |
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