Coherence resonance induced by the deviation of non-Gaussian noise in coupled Hodgkin-Huxley neurons.
Neurons are noisy elements. Noise arises from both intrinsic and extrinsic sources. In this paper, we numerically study the effect of a particular kind of colored non-Gaussian noise (NGN), mainly of its deviation q from Gaussian noise, on the collective firing in bidirectionally coupled deterministic Hodgkin-Huxley neurons. It is found that the coefficient of variation (CV), characterizing the temporal regularity of the collective spikes, nonlinearly changes with increasing q and passes through a minimum at an intermediate optimal q where the collective spiking becomes most regular, which represents the presence of coherence resonance (CR). We also present a global view of CV as a function of q and neuron number N under various appropriate values of noise intensity. For each value of noise intensity, there is an island present in the contour plot, which sufficiently demonstrates the phenomenon of "q-induced CR." This phenomenon, termed as q-induced CR, shows that there is an optimal deviation of the NGN by which the coupled neurons may behave most periodically in time. Our results provide a novel constructive role of the deviation of the NGN in information processing and signal transduction in real neural systems.
Gong
Yubing
Y
School of Physics and Electronic Engineering, Ludong University, Yantai, Shandong 264025, People's Republic of China. ybgong63@hotmail.com
Xie
Yanhang
Y
Hao
Yinghang
Y
D000200:Action Potentials; D006801:Humans; D008954:Models, Biological; D009415:Nerve Net / Q000502:physiology*; D009474:Neurons / Q000502:physiology*; D016008:Statistical Distributions