TITLE

Nonlinear dynamics of a pulse-coupled neural oscillator model of orientation tuning in the visual cortex

AUTHOR(S)
Bressloff, P. C.; Bressloff, N. W.
PUB. DATE
February 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 502 Issue 1, p80
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Orientation tuning in a ring of pulse-coupled integrate-and-fire (IF) neurons is analyzed in terms of spontaneous pattern formation. It is shown how the ring bifurcates from a synchronous state to a non-phase-locked state whose spike trains are characterized by quasiperiodic variations of the inter-spike intervals (ISIs) on closed invariant circles. The separation of these invariant circles in phase space results in a localized peak of activity as measured by the time-averaged firing rate of the neurons. This generates a sharp orientation tuning curve that can lock to a slowly rotating, weakly tuned external stimulus. For fast synapses, breakup of the quasiperiodic orbits occurs leading to high spike time variability suggestive of chaos. © 2000 American Institute of Physics.
ACCESSION #
6028484

 

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