Center for Dynamics of Complex Systems

Evgenii I. Volkov and M.N. Stolyarov

Department Theoretical Physics, Lebedev Physical Inst., Leninskii 53, Moscow, Russia

November 19, 2001, 15:15

Talk: Spiking behavior in noise-driven inhibitorily coupled excitable relaxators

We have analyzed the firing activity of two or three excitable FitzHugh-Nagumo (FHN) units under external noise and in the presence of coupling via slow variable diffusion. We show that such an exchange, which is remarkably rhythmogenic for the coupled limit cycles, results in the polymodal interspike interval histograms (ISIH) without any external periodic stimuli. The ISIH shape was found to vary depending on the noise amplitude, the coupling strength, and the value of stiffness. The main qualitative changes in the ISIH shape are explained by microscopically analyzing the trajectory behavior.

November 21 - December 14, 2001

Lecture series: How coupling may create the new rhythms?

Contact: Udo Schwarz