Max Planck Institute for Dynamics and Self-Organization -- Department for Nonlinear Dynamics and Network Dynamics Group
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BCCN Sonderseminar

Tuesday, 06.03.2007 16 c.t.

Reverse of firing causality by synchronous neural activity

by Myoung Won Cho
from Seoul National University, Korea

Contact person: J. Michael Herrmann

Location

Seminarraum Haus 2, 4. Stock (Bunsenstr.)

Abstract

It is commonly believed that spike timings of a postsynaptic neuron tend to follow those of the presynaptic neuron. Such orthodromic firing may, however, cause a conflict with the functional integrity of the geometrically complex dendritic tree due to asymmetric temporal Hebbian plasticity. We argue that reversed spike timings in a synapse are a typical phenomenon in the cortex, which has a stabilizing effect onto the dendritic structures. We demonstrate how the firing causality in a synapse is perturbed by synchronous neural activity, and how the equilibrium properties of spike-timing dependent plasticity in a network is determined principally by the degree of synchronization.We find that even noise-induced activity and synchrony of neurons can result in an equalization of synaptic efficacy.

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