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Fluid limit theorems for stochastic hybrid systems with application to neuron models

Published online by Cambridge University Press:  01 July 2016

K. Pakdaman*
Affiliation:
Université Paris VII
M. Thieullen*
Affiliation:
Université Paris VI
G. Wainrib*
Affiliation:
Ecole Polytechnique, Université Paris VII and Université Paris VI
*
∗ Postal address: Institut Jacques Monod UMR7592, Bâtiment Buffon, 15 rue Hélène Brion, 75205 Paris cedex 13, France.
∗∗ Postal address: Laboratoire de Probabilités et Modèles Aléatoires UMR7599, Boîte 188, 175 rue du Chevaleret, 75013 Paris, France.
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Abstract

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In this paper we establish limit theorems for a class of stochastic hybrid systems (continuous deterministic dynamics coupled with jump Markov processes) in the fluid limit (small jumps at high frequency), thus extending known results for jump Markov processes. We prove a functional law of large numbers with exponential convergence speed, derive a diffusion approximation, and establish a functional central limit theorem. We apply these results to neuron models with stochastic ion channels, as the number of channels goes to infinity, estimating the convergence to the deterministic model. In terms of neural coding, we apply our central limit theorems to numerically estimate the impact of channel noise both on frequency and spike timing coding.

Information

Type
General Applied Probability
Copyright
Copyright © Applied Probability Trust 2010