Endogenous fields enhanced stochastic resonance in a randomly coupled neuronal network

Endogenous fields enhanced stochastic resonance in a randomly coupled neuronal network
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内源场增强随机耦合神经元网络中的随机共振

DOI:
10.1016/j.chaos.2014.07.006
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发表时间:
2014-11
影响因子:
7.8
通讯作者:
Yu, Hai-tao
Yu, Hai-tao
中科院分区:
数学1区
文献类型:
--
作者:
Wang, Lin;Wang, Jiang;Wei, Xi-le;Yu, Hai-tao

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内源性场是在体内由结构神经元网络活动引起的,与许多重要的神经过程相关。本文研究了内源场对随机连接神经网络随机共振的影响。神经网络由兴奋性神经元和抑制性神经元组成,并考虑了神经元间的轴突传导延迟。数值结果表明,在适当的时滞和反馈系数下,内源场反馈使网络的宏观激活更具节律性。内源性场反馈可以显著增强神经网络对弱周期刺激的响应。此外,内源性场反馈延迟在SR中起着至关重要的作用。我们发现,在相同的反馈系数下,适当调整反馈延迟可以诱导SR的增强,出现在弱输入信号振荡周期的每一个整数倍处,或者导致SR的降低,出现在弱输入信号振荡周期的每一个整数倍处。有趣的是,用于获取内源场反馈信号的低通滤波器的参数在SR中起着微妙的作用。
Endogenous field, evoked by structured neuronal network activity in vivo, is correlated with many vital neuronal processes. In this paper, the effects of endogenous fields on stochastic resonance (SR) in a randomly connected neuronal network are investigated. The network consists of excitatory and inhibitory neurons and the axonal conduction delays between neurons are also considered. Numerical results elucidate that endogenous field feedback results in more rhythmic macroscope activation of the network for proper time delay and feedback coefficient. The response of the network to the weak periodic stimulation can be notably enhanced by endogenous field feedback. Moreover, the endogenous field feedback delay plays a vital role in SR. We reveal that appropriately tuned delays of the feedback can either induce the enhancement of SR, appearing at every integer multiple of the weak input signal’s oscillation period, or the depression of SR, appearing at every integer multiple of half the weak input signal’s oscillation period for the same feedback coefficient. Interestingly, the parameters of low-passed filter which is used in obtaining the endogenous field feedback signal play a subtle role in SR.
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