MEMORY EFFECTS ON STOCHASTIC RESONANCE

We study the phenomenon of stochastic resonance (SR) in a bistable sys tem with internal colored noise. In this situation the system possesse s time-dependent memory friction connected with noise via the fluctuat ion-dissipation theorem, so that in the absence of periodic driving th e system approaches the thermodynamic equilibrium state. For this non- Markovian case we find that memory usually suppresses stochastic reson ance. However, for a large memory time SR can be enhanced by the memor y.