Coherence resonance in coupled theta neurons

초록

We study the temporal coherence resonance (CR) of a local neuron in an excitatory network of globally coupled canonical type-I theta neurons. For the (isolated) single case, a subthreshold theta neuron exhibits a maximal correlation without any spectral coherence at some optimal noise intensity (i.e., occurrence of maximal correlation without any appearance of peaks in the output power spectrum). This kind of "weak" CR is in contrast to "strong" CR (i.e., occurrence of maximal correlation along with the spectral CR) occurring in the type-II excitable neuron. For the coupled case, each local neuron may be driven by a temporally coherent synaptic current occurring due to spatial coherence between neural spikings. Consequently, a strong CR may occur through the appearance of peaks in the local output power spectrum.

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