非线性积分点火模型的相干共振  

Coherence Resonance of a Nonlinear Integral-and-Fire Model

作　　者：周玉荣[1] 郝小江[2] 张安英[1] 庞小峰[1] 

机构地区：[1]电子科技大学生命科学与技术学院,成都610054 [2]攀枝花学院电气信息工程学院,四川攀枝花617000

出　　处：《电子科技大学学报》2008年第5期724-726,776,共4页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金(30600127)

摘　　要：研究了电压门控离子通道噪声和突触噪声共同作用下非线性积分点火模型的相干共振现象。基于绝热近似理论,得到了神经元首次点火概率分布、神经元点火率和神经元点火峰峰间隔的变差系数的近似表达式。研究表明,首次点火概率分布、点火率是离子通道噪声和突触噪声的强度的非单调函数,适当的噪声强度可使神经元自发点火,即出现相干共振现象。The phenomenon of coherence resonance of a nonlinear integral, and-fire model subject to a voltage-gated channel noise and a synaptic noise is investigated. Based on the adiabatic approximation theory, we obtain the approximate expressions of the firing rate （FR）, the probability distribution of the first fire （FPD）, and the coefficient of variation （CV） of interspike interval of firing. It is shown that the FPD and the FR are non-monotonic functions of the strength of the voltage-gated channel noise and the synaptie noise. Furthermore, by choosing appropriate noise parameter, spontaneous fire of neuron can occur, i.e., the phenomenon of coherence resonance can take place.

关 键 词：绝热近似 变差系数 相干共振 点火率 首次点火 

分 类 号：O211.64[理学—概率论与数理统计]