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 Geisel1 — 1Dept. 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