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System Size Coherence Resonance in Coupled FitzHugh-Nagumo Models

Toral, R.; Mirasso, C.; Gunton, J.D.
Europhysics Letters 61, 162-167 (2003)

We show the existence of a system size coherence resonance effect for coupled excitable systems. Namely, we demonstrate numerically that the regularity in the signal emitted by an ensemble of globally coupled FitzHugh-Nagumo systems, under excitation by independent noise sources, is optimal for a particular value of the number of coupled systems. This resonance is shown through several different dynamical measures: the time correlation function, correlation time and jitter.