Gamma frequency synchronization in a local cortical network model

In this modeling study, we show the combined e ects of gap junctions and GABAergic synapses on the synchronous ring in networks of fast-spiking (FS) interneurons. We found analytically that two identical electrically coupled FS interneurons re synchronously at arbitrary ring frequencies, whereas an FS neuron pair coupled through GABAergic synapses show asynchronous ring. Accordingly, an FS neuron pair connected simultaneously by electrical and chemical synapses achieves both synchronous and anti-synchronous ring state in a physiologically plausible range of the conductance ratio between electrical and chemical synapses. We also investigate how two identical oscillator units composed of a regular-spiking pyramidal neuron and an FS interneuron may cooperatively re at several phase-locked states. c © 2004 Elsevier B.V. All rights reserved.