title: Effective stochastic resonance of coupled excitable elements under noise of unequal amplitude.
abstract: Effective stochastic resonance (SR) is numerically studied using a model of two coupled excitable FitzHugh-Nagumo elements exposed to noise of unequal amplitude. Compared to previous SR models of a single excitable element and of two coupled excitable elements exposed to noise of equal amplitude, the present model exhibits a more intense resonance to the external signal. To extract the key dynamics of this effective SR, the idea of triggered excitation is introduced. Triggered excitation means a process in which the noise-free element is excited synchronously to the external signal with the triggering action of another element that randomly fluctuates asynchronously to the external signal. A deterministic simulation simply proving the triggered excitation process supports our idea.
authors.affiliation: Department of Mathematical and Life Sciences, Hiroshima University, Kagamiyama, Higashi-hiroshima 739-8526, Japan.
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Kawai
authors.forename: Akinori
authors.initials: A
authors.lastname: Awazu
authors.forename: Hiraku
authors.initials: H
authors.lastname: Nishimori