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Neural Computation, Vol 10, 837-854, Copyright © 1998 by The MIT Press
LETTERS |
Sharon M. Crook, G. Bard Ermentrout and James M. Bower
Oscillations in many regions of the cortex have common temporal
characteristics with dominant frequencies centered around the 40 Hz (gamma)
frequency range and the 5
10 Hz (theta) frequency range.
Experimental results also reveal spatially synchronous oscillations, which
are stimulus dependent (Gray & Singer, 1987; Gray, Konig,
Engel, &Singer, 1989; Engel, Konig, Kreiter, Schillen,
& Singer, 1992). This rhythmic activity suggests that the coherence
of neural populations is a crucial feature of cortical dynamics (Gray,
1994). Using both simulations and a theoretical coupled oscillator
approach, we demonstrate that the spike frequency adaptation seen in many
pyramidal cells plays a subtle but important role in the dynamics of
cortical networks. Without adaptation, excitatory connections among model
pyramidal cells are desynchronizing. However, the slow processes associated
with adaptation encourage stable synchronous behavior.
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