Resemblances and differences in mechanisms of noise-induced resonance

Sysyems showing stochastic or coherent resonance share some features, in particular the nearby periodic character of the signal. We show that in spite of this resemblance the different underlying dynamics can be detected in experimental data by studying the histogram of inter-pikes times and some other statistical properties like two-times correlation functions. We discuss the possible relevance for modeling the Dansgaard-Oeschger climatic events.