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UID:20251007T021448EDT-949778VN9u@132.216.98.100
DTSTAMP:20251007T061448Z
DESCRIPTION:Around the complex interplay of spatial organization\, heteroge
 neity and collective dynamics of neuronal networks\n\nAbstract: Increasing
  biological evidence suggests that the anatomical and functional organizat
 ion of neuronal networks of the brain subtend their function. This talk wi
 ll discuss a few questions related to this interplay and on which mathemat
 ical approach can shed new light.\n\nFirst\, I will discuss the characteri
 zation of large-scale dynamics of randomly connected neural networks\, in 
 particular taking into account their multi-scale connectivity patterns. I 
 will investigate the role of noise and disorder in these macroscopic dynam
 ics\, with a particular focus on a mysterious and somewhat paradoxical rol
 e of noise or disorder in synchronizing neurons.\n\nCloser from biology\, 
 I will present a new dataset and analyses on the functional organization o
 f the visual cortex that tend to indicate that orientation and spatial fre
 quency of simple stimuli organize within continuous maps with common punct
 ual singularities that have a very particular pinwheel-dipole topology. Us
 ing arguments from planar topology\, I will show that how these may reveal
  that exhaustivity and parsimony of representation may be fundamental orga
 nization principles of the primary visual area.\n
DTSTART:20161128T200000Z
DTEND:20161128T200000Z
LOCATION:Room 920\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Jonathan Touboul - Collège de France
URL:/mathstat/channels/event/jonathan-touboul-college-
 de-france-264291
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