Eur. Phys. J. B (2012) 85: 299
https://doi.org/10.1140/epjb/e2012-30452-0

Regular Article

Dependence of delay-induced coherence resonance on time-periodic coupling strength in Newman-Watts neuronal networks

School of Physics and Optoelectronic Engineering, Ludong University, Yantai, Shandong 264025, P.R. China

^a e-mail: gongyubing09@hotmail.com

Received: 7 June 2012
Received in final form: 7 July 2012
Published online: 5 September 2012

Abstract

Recently, delay-induced coherence resonance (CR) in neuronal networks with fixed coupling strength has received much attention. In this paper, we study delay-induced CR in Newman-Watts neuronal networks with time-periodic coupling strength, mainly investigating how CR changes with the varying frequency of time-periodic coupling strength. We find that delay-induced CR become more frequent as the frequency is increased. When the frequency exceeds a threshold value, time delay can induce multiple CR more than for constant coupling strength. Furthermore, delay-induced CR occurs more abruptly and becomes more pronounced for time-periodic coupling strength than for constant coupling strength. These results show that delay-induced CR strongly depends on the coupling strength of neurons, and time delay can optimize spiking coherence more frequently and precisely in the presence of time-periodic coupling strength. This implies that time-periodic coupling strength could be more helpful for time delay to enhance and optimize the spiking coherence, and thus it may play a more efficient role in improving the time precision of information processing in neuronal networks.