Masoliver, M.; Malik, N.; Schöll, E.; Zakharova, A. Chaos : an interdisciplinary journal of nonlinear science Vol. 27, num. 10, p. 2-8 DOI: 10.1063/1.5003237 Data de publicació: 2017-10-01 Article en revista
We systematically investigate the phenomena of coherence resonance in time-delay coupled networks of FitzHugh-Nagumo elements in the excitable regime. Using numerical simulations, we examine the interplay of noise, time-delayed coupling, and network topology in the generation of coherence resonance. In the deterministic case, we show that the delay-induced dynamics is independent of the number of nearest neighbors and the system size. In the presence of noise, we demonstrate the possibility of controlling coherence resonance by varying the time-delay and the number of nearest neighbors. For a locally coupled ring, we show that the time-delay weakens coherence resonance. For nonlocal coupling with appropriate time-delays, both enhancement and weakening of coherence resonance are possible.
Copyright 2017 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing
We study two coupled neurons using the FitzHugh-Nagumo model. We analyze how mutual
coupling affects the detection and transmission of a periodic, subthreshold signal that is applied to only one of the neurons. Recent work has shown that, in a single neuron, the interplay of noise and modulation induces temporal ordering in the spike sequence. We analyze under which conditions the coupling to a second neuron further enhances the temporal order of the spikes of the first neuron, improving signal encoding. We also study which conditions enhance temporal order in the spikes of the second neuron, improving signal transmission.