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Amplified Signal Response by Neuronal Diversity on Complex Networks |
| SHEN Chuan-Sheng1,2;CHEN Han-Shuang2;ZHANG Ji-Qian2 |
| 1Department of Educational Technology, Anqing Teachers College, Anqing 2460112College of Physics and Electronic Information, Anhui Normal University, Wuhu 241000 |
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SHEN Chuan-Sheng, CHEN Han-Shuang, ZHANG Ji-Qian 2008 Chin. Phys. Lett. 25 1591-1594 |
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Abstract The effect of diversity on dynamics of coupled FitzHugh--Nagumo neurons on complex networks is numerically investigated, where each neuron is subjected to an external subthreshold signal. With the diversity the network is a mixture of excitable and oscillatory neurons, and the diversity is determined by the variance of the system's parameter. The complex network is constructed by randomly adding long-range connections (shortcuts) on a nearest-neighbouring coupled one-dimensional chain. Numerical results show that external signals are maximally magnified at an intermediate value of the diversity, as in the case of well-known stochastic resonance. Furthermore, the effects of the number of shortcuts and coupled strength on the diversity-induced phenomena are also discussed. These findings exhibit that the diversity may play a constructive role in response to external signal, and highlight the importance of the diversity on such complex networks.
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05.40.-a
05.45.-a
05.45.Xt
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Received: 23 January 2008
Published: 29 April 2008
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| PACS: |
05.40.-a
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(Fluctuation phenomena, random processes, noise, and Brownian motion)
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05.45.-a
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(Nonlinear dynamics and chaos)
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05.45.Xt
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(Synchronization; coupled oscillators)
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