Regensburg 2010 – scientific programme
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BP: Fachverband Biologische Physik
BP 35: Posters: Statistical Physics, Evolution, and Networks
BP 35.3: Poster
Thursday, March 25, 2010, 17:15–20:00, Poster B2
Spontaneous spiking in presence of delayed feedback — •Yunyun Li1, Gerhard Schmid1, Peter Hänggi1, and Lutz Schimansky-Geier2 — 1University of Augsburg, Augsburg, Germany — 2Humboldt-University Berlin, Berlin, Germany
Autapse is an interesting phenomena on neurons where axons synapsing on the same neuron’s dendrites. This serves as delayed feedback mechanism in the dynamics of neuronal firing. Due the stochastic ion channel gating, there is intrinsic noise presented in the system which leads to spontaneous spiking[1]. Our modeling is done within a stochastic Hodgkin-Huxley model with self-delayed feedback of Pyragas-type. The delayed feedback introduced another time scale leading a competition between the delay time and characteristic intrinsic time of the Hodgkin-Huxley dynamics. Upon the intrinsic noise level and the coupling strength of the delayed coupling the firing exhibits bursting leading a multimodal structure in the interspike interval histogram. For the spontaneous spiking, both the mean interspike interval, and the coherence exhibits modulations upon varying the delay time.
[1] G. Schmid, I. Goychuk, P. Hänggi, Europhys. Lett. 56, 22 (2001).