Stochastic resonance in spatiotemporal on–off intermittency

Stochastic resonance is investigated in a generic system with spatiotemporal on–off intermittency: a chain of coupled logistic maps with a time-dependent control parameter, driven by a spatiotemporal periodic signal. Spatiotemporal correlation function between the periodic signal and the output signal, reflecting the occurrence of laminar phases and chaotic bursts, has a maximum as a function of the mean value of the control parameter. For a given period and length of the periodic signal the height of this maximum can be increased by choosing an optimum coupling strength between maps. It is argued that the obtained result can be interpreted as an example of noise-free (dynamical) stochastic resonance in a system with spatiotemporal intermittency.