Dynamics of Stochastic Neuronal Networks and the Connections to Random Graph Theory

R. E. Lee DeVille¹ ; C. S. Peskin² ; J. H. Spencer²

¹ Department of Mathematics, University of Illinois, Urbana, IL 60801
² Courant Institute of Mathematical Sciences, New York University, New York, NY 10012

Mathematical modelling of natural phenomena, Tome 5 (2010) no. 2, pp. 26-66.

Résumé

We analyze a stochastic neuronal network model which corresponds to an all-to-all network of discretized integrate-and-fire neurons where the synapses are failure-prone. This network exhibits different phases of behavior corresponding to synchrony and asynchrony, and we show that this is due to the limiting mean-field system possessing multiple attractors. We also show that this mean-field limit exhibits a first-order phase transition as a function of the connection strength — as the synapses are made more reliable, there is a sudden onset of synchronous behavior. A detailed understanding of the dynamics involves both a characterization of the size of the giant component in a certain random graph process, and control of the pathwise dynamics of the system by obtaining exponential bounds for the probabilities of events far from the mean.

Détail

DOI : 10.1051/mmnp/20105202

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