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Divisive inhibition reshapes visual receptive fields to implement optimal source separation| old_uid | 5987 |
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| title | Divisive inhibition reshapes visual receptive fields to implement optimal source separation |
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| start_date | 2009/01/15 |
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| schedule | 13h45 |
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| online | no |
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| summary | Experimental studies have demonstrated that stimuli outside the classical receptive field (cRF) of a visual neuron can nevertheless strongly modulate the cell’s response to stimuli inside the cRF. The extent and influence of the cRFs and ncRFs, and the amplitude of the response also varies as a function of contrast and time. In particular, these observations hint at a coarse to fine coding continuum as more information becomes available. Here we show that cRF and ncRF spatial properties, their temporal dynamics and contextual dependencies can emerge naturally from detecting objects in movies. This approach draws a parallel between the spatio-temporal statistics of the visual input and the plasticity and dynamics of a network of adapting integrate and fire neurons. In particular, divisive inhibition (as opposed to subtractive inhibition) emerges as an essential component of visual processing since it is necessary to solve ambiguities between different possible interpretations of a visual input.
Brief Biography : Dr Sophie Deneve studied in the field of neuroscience and mathematics at the Ecole Normale Superieure in Paris. She obtained her PhD in Brain and cognitive sciences at University of Rochester in 2003, in the laboratory of Alexandre Pouget. After a postdoc in Gatsby Computational Neuroscience unit, London, she became an assistant professor at the institute of cognitive science in Lyon, in 2004. In 2006, she moved to Paris to lead the Group for Neural Theory, a EU funded team of researchers in the field of computational neuroscience. Her main research interests include investigating the neural basis of probabilistic inference and learning. |
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| responsibles | Fenouil |
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