Berlin 2008 – wissenschaftliches Programm
DY 17.50: Poster
Dienstag, 26. Februar 2008, 16:00–18:00, Poster C
Synfire chains in Integrate-and-fire networks with unreliable synapses — •Johannes Friedrich and Wolfgang Kinzel — Institute of Theoretical Physics and Astrophysics, University of Würzburg, Am Hubland, Würzburg, Germany
There is experimental evidence that synapses transmit an incoming spike not deterministically but with some probability which may be as low as a few percent. We investigated the properties of a network of identical integrate-and-fire neurons with unreliable inhibitory synapses which transmit with a delay time.
Without temporal delay, the network relaxes to a state of high attention: Most of the neurons collect just below threshold and are prepared to react immediately to an incoming excitation.
With time delay the network relaxes to a state with clusters, or synfire chains. The whole network consists of clusters of identical size which are stable, instead of the probabilistic nature of the synapses. The number of clusters does not depend on the probability p of synaptic transmission, but their survival time decreases with decreasing p. The number of possible configurations of synfire chains increases exponentially with the size of the network.
Ref: Wolfgang Kinzel, J Comput Neurosci