Stochastic resonance in a coupled Hodgkin-Huxley equation is investigated.
The dependence of signal to noise ratio on the frequencies of the periodic
input signals is examined by numerical experiments. Two or three Hodgkin-Hu
xley equations are coupled with a propagational time delay to compose a net
work. For a network with two elements, an enhancement of the stochastic res
onance for the periodic input signals with particular frequencies is found.
It is also found that a network with three elements is capable of distingu
ishing periodic input signals by those frequencies.