Frequency and phase locking of noise-sustained oscillations in coupled excitable systems: array-enhanced resonances.
We study the interplay among noise, weak driving signal and coupling in excitable FitzHugh-Nagumo neurons. Due to coupling, noise-sustained oscillations become locked to the signal as functions of both signal frequency and noise intensity. Higher order m:n locking tongues and various array-enhanced resonance features are demonstrated. This resonance and locking behavior due to a time scale matching between noise-sustained oscillations and the signal is fundamentally different from stochastic resonance in usual noisy threshold elements.
Zhou
Changsong
C
Institute of Physics, University of Potsdam, PF 601553, 14415 Potsdam, Germany.
Kurths
Jürgen
J
Hu
Bambi
B