Stochastic resonance in a pulse neural network with a propagational time delay

Stochastic resonance in a coupled FitzHugh-Nagumo equation with a propagati onal time delay is investigated. With an appropriate set of parameter value s, i.e. the frequency of the periodic input, the propagational time delay, and the coupling strength, a deterministic firing induced by additive noise is observed, and its dependence on the number of neurons is examined. It i s also found that a network composed of two assemblies shows a competitive behavior under control of the noise intensity. (C) 2000 Elsevier Science Ir eland Ltd. All rights reserved.