Berlin 2008 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 5: Statistical physics in biological systems (joint session DY/BP)

DY 5.2: Vortrag

Montag, 25. Februar 2008, 14:45–15:00, MA 001

A simple model for spike timing dependent plasticity — Heinz Georg Schuster and •Jörg Mayer — Institute of Theoretical Physics and Astrophysics University of Kiel, D-24098 Kiel, Germany

Several experimental results indicate that the strength of cortical synaptic connections varies in dependence of the relative timing of pre- and postsynaptic spikes. We introduce a simple time discrete model of spike timing dependent plasticity. In our model the strength of synapses is increased if the timing of pre and postsynaptic spikes occur causal and decreased if they occur anti-causal. For reasons of convergence we further introduce a leakage term in the dynamics of the synapses. We find that stochastic independent input leads to a phase transition and further observe coherence resonance in dependence of the amplitude of the input noise. Further we derive the equations of motion for the mean field activity analytically.