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BP: Fachverband Biologische Physik

BP 14: Neuronal and Sensory Systems

BP 14.4: Vortrag

Mittwoch, 25. März 2009, 15:00–15:15, HÜL 186

Comparison of stochastic integrate-and-fire models — •Benjamin Lindner and Rafael D. Vilela — Max-Planck-Institute for the Physics of Complex Systems, Dresden, Germany

We study three different integrate-and-fire (IF) models, the perfect, leaky, and quadratic IF model driven by white Gaussian noise and present a systematic comparison of their spontaneous and driven firing statistics in terms of power spectra, susceptibilities, and coherence functions. We also look at the correlations induced in the spike trains of two neurons by a common stimulus. Our comparison is based on parameter choices for the different models that make their firing rate and the CV of their interspike intervals equal --- a choice that is unique for the three models under investigation as we have recently demonstrated[1]. We find that power spectra are rather similar for all three models while the input-output and the correlation statistics depend on the specific voltage dependence of the model and on the firing regime (combination of rate and CV) considered. Refs: [1] R. D. Vilela and B. Lindner J. Theor. Biol. (in press, 2008).