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Accueil du site > Seminars > Séminaires théorie > Theory Club Wednesday, November 22 at 12:30pm in room 646A. Vincent Hakim: "Synchronization of oscillatory activity and waves in neuronal networks with spatially structured connectivity".

Theory Club Wednesday, November 22 at 12:30pm in room 646A. Vincent Hakim: "Synchronization of oscillatory activity and waves in neuronal networks with spatially structured connectivity"

Unless otherwise stated, seminars and defences take place at 11:30 in room 454A of Condorcet building.


Synchronization of oscillatory activity and waves in neuronal networks with spatially structured connectivity

Vincent Hakim

Abstract: Neural rhythms and collective oscillations are ubiquitously recorded in neural structures. Oscillations with 10-45Hz frequency (in the so-called «beta/low gamma» range) are thought to arise from reciprocal interactions between excitatory ( E) and inhibitory  (I) neurones. Most modelling studies assume E-I networks with random unstructured connectivities. However,  several experimental results point out the need to model and analyze the spatial  organization of oscillatory neuronal activity.  After describing some of these data, I will describe our recent work in this direction. I will show that long-range excitation can either synchronize or desynchronize oscillatory activity of distinct E-I modules, depending on its strength and the specific considered connectivity. I will also show that stochastic action potential emission by individual neurones gives rise to noise at the module level that needs to be taken into account. As a result, the  phase dynamics in a 1D chain of E-I modules is found to be described by the Edwards-Wilkinson, KPZ or noisy Kuramoto-Sivashinsky equations. I will discuss how this may help to explain recording data in the motor cortex during movement preparation.

Wednesday, November 22 in 12:30pm in room 646A


Contact : Équipe séminaires / Seminar team - Published on / Publié le 10 November


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