title: Coherence resonance and polymodality in inhibitory coupled excitable oscillators.
abstract: We have analyzed the firing activity of two and three excitable FitzHugh-Nagumo oscillators, coupled via slow variable diffusion and under the action of an external noise. We find a different form of coherence resonance in this system, which is, in contrast to previous studies, intrinsically based on the antiphase behavior of coupled elements. Additionally, we show that an exchange, performed by this form of coupling, is remarkably rhythmogenic and results in polymodal interspike distributions without any external periodic stimuli. The dependence of these distributions on the noise amplitude and the coupling strength is studied.
authors.affiliation: Department Theoretical Physics, Lebedev Physical Institute, Leninskii, Russia.
authors.forename: E I
authors.initials: EI
authors.lastname: Volkov
authors.forename: M N
authors.initials: MN
authors.lastname: Stolyarov
authors.forename: A A
authors.initials: AA
authors.lastname: Zaikin
authors.forename: J
authors.initials: J
authors.lastname: Kurths