Stochastic resonance in coupled threshold elements with input signals shifted in phase

Stochastic resonance in a system of two coupled threshold elements (neurons ) forming a small artificial neural network is investigated. The elements h ave either antisymmetric or logistic (binary) response Function and are dri ven by periodic signals and independent noises. Periodic signals at their i nputs have equal amplitudes and frequencies but are shifted in phase. Depen ding on the response function and the phase shift, enhancement of stochasti c resonance in individual elements, characterized by the output signal-to-n oise ratio, and stochastic resonance with a spatiotemporal input signal, ch aracterized by the correlation function between the input and output signal s, are observed for proper coupling between elements.