Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Date Mardi 29 Mai 2018
Heure 17:15
Salle Jean Jaures (29 rue d'Ulm)
Nom de l'orateur Bialek
Prenom de l'orateur William
Addresse email de l'orateur
Institution de l'orateur Princeton University
Titre Towards a renormalization group for networks of neurons
Résumé In many systems we can describe emergent macroscopic behaviors, quantitatively, using models that are much simpler than the underlying microscopic interactions; we understand the success of this simplification through the renormalization group. Could similar simplifications succeed in complex biological systems? I will discuss explicit coarse-graining procedures, analogous to real-space and momentum space RG, that we apply to experimental data on the electrical activity in large populations of neurons in the mouse hippocampus. Probability distributions of coarse-grained variables seem to approach a fixed non-Gaussian form, and we see evidence of power-law dependencies in both static and dynamic quantities as we vary the coarse-graining scale over two decades. Taken together, these results suggest that the collective behavior of the network is described by a non-trivial fixed point.
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