Coherent resonance in a one-way coupled system

We describe the resonancelike behavior of a cooperative phenomenon involvin g noise, nonlinear systems with intrinsic limit cycle dynamics, and couplin g in the absence of an external signal. We show that coupling can significa ntly sustain the propagation of coherent resonance with considerable enhanc ement or suppression along a one-way chain. In addition, coherent resonance can occur without tuning for a proper noise level and coupling constant.