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Dresden 2003 – scientific programme

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.56: Poster

Thursday, March 27, 2003, 15:30–18:00, P1

Latency Variability of Joint-Spike Events in Cortical Synfire Networks — •Michael Buschermöhle1, Tom Tetzlaff1, Sonja Grün2, Markus Diesmann1, and Theo Geisel11Dept. of Nonlinear Dynamics, MPI für Strömungsforschung, D-37073 Göttingen — 2FU Berlin, Institut für Biologie, Neurobiologie, D-14195 Berlin

Experiments provide evidence for the appearance of precise joint-spike events in cortical networks [1,2], which are only loosely time locked to external events. A network structure known to be able to generate spike coincidences with ms jitter is the synfire chain [3]. Here, we analyze the latency variability of this system (cf. [4]). Focusing on sharp stimuli, we can determine a lower bound of response jitter. Different aspects of the dynamics contribute characteristically to the total variability. The dependence on properties of the stimulus and network parameters is discussed. Under suitable conditions latency variability can exceed the temporal jitter within joint-spike events by an order of magnitude.
[1] Riehle et al. (1997) Science 278:1950-1953
[2] Prut et al. (1998) J. Neurophysiol. 79:2857-2874
[3] Abeles (1991) Corticonics, Cambridge University Press
[4] Grün (1996) Unitary Joint-Events in Multiple-Neuron Spiking Activity, Verlag Harri Deutsch

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