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Firing rates of coupled noisy excitable elements |
Shuai Liu1,2, Zhi-Wei He1,2, Meng Zhan1() |
1. Wuhan Center for Magnetic Resonance, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China; 2. University of the Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The dynamics of coupled excitable FitzHugh–Nagumo systems under external noisy driving is studied. Different from most of previous work focusing on the noise-induced regularity in the framework of coherence resonance, here the average frequency (or firing rate) of coupled excitable elements is of much more concern. We find that (i) their frequencies first increase and then decrease with the increase of the coupling, and there is a clear crossover from a rush increase to a smooth increase with the increase of noise strength, and (ii) for nonidentical cases, all elements transit to an identical frequency simultaneously only after a certain coupling strength is achieved. These first-increase-thendecrease non-monotonic frequency behavior and isochronous frequency synchronization are believed to be two basic behaviors in coupled noisy excitable systems.
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Keywords
coupled excitable elements
firing rate
noise
coherence resonance
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Corresponding Author(s):
Zhan Meng,Email:zhanmeng@wipm.ac.cn
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Issue Date: 01 February 2014
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