Europhys. Lett.
Volume 61, Number 2, January 2003
Page(s) 162 - 167
Section General
Published online 01 January 2003
DOI: 10.1209/epl/i2003-00207-5
Europhys. Lett., 61 (2) , pp. 162-167 (2003)

System size coherence resonance in coupled FitzHugh-Nagumo models

R. Toral1, 2, C. R. Mirasso1 and J. D. Gunton2, 3

1  Departament de Física, Universitat de les Illes Balears E-07071 Palma de Mallorca, Spain
2  Instituto Mediterráneo de Estudios Avanzados (IMEDEA), CSIC-UIB E-07071 Palma de Mallorca, Spain
3  Department of Physics, Lehigh University - Bethlehem, PA 18015, USA (Permanent address.)

(Received 26 July 2002; accepted in final form 4 November 2002)

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.

05.40.Ca - Noise.
05.45.-a - Nonlinear dynamics and nonlinear dynamical systems.
05.45.Xt - Synchronization; coupled oscillators.

© EDP Sciences 2003