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arXiv 1202.2491q-bio.NC
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高斯白噪声下Hodgkin-Huxley神经元的逆随机共振和长时程放电分析

Analysis of inverse stochastic resonance and the long-term firing of Hodgkin-Huxley neurons with Gaussian white noise

Henry C. Tuckwell, Jürgen Jost

摘要:

在以前的文章中,我们研究了标准的Hodgkin-Huxley(HH)系统的常微分方程和偏微分方程响应于由漂移(平均值)和加性高斯白噪声组成的输入电流的发射特性。对于一定的平均电流值,随着噪声幅值从零开始增加,放电率呈现最小值,这种现象被称为逆随机共振(ISR)。在这里,我们分析了从一个稳定的平衡点的极限环,反之亦然的基本过渡。针对平均输入电流密度为$μ=6.8$的情况,在该电流密度下发生重复放电,ISR被发现是显著的,发现了相应的稳定平衡点的一些性质,在该点附近的线性化近似具有振荡解,其最大尖峰往往发生。基于HH变量对之间的相关性和其中两个变量的小幅度波动,还构造了小噪声的一维扩散。的极限环(尖峰)的吸引力盆的属性进行了研究,也是在非常小的噪声对应的轨迹,从来没有进入吸引力盆的平衡点尖峰分布的性质。对于噪声参数$σ$从0到2.0的值,进行持续时间为500000 ms的长期试验,结果见第3节。平均尖峰计数与$σ$的关系图分为4个区域$R_1,...,R_4,$,其中$R_3$包含与ISR相关的最小值。

英文摘要:

In previous articles we have investigated the firing properties of the standard Hodgkin-Huxley (HH) systems of ordinary and partial differential equations in response to input currents composed of a drift (mean) and additive Gaussian white noise. For certain values of the mean current, as the noise amplitude increased from zero, the firing rate exhibited a minimum and this phenomenon was called inverse stochastic resonance (ISR). Here we analyse the underlying transitions from a stable equilibrium point to the limit cycle and vice-versa. Focusing on the case of a mean input current density $μ=6.8$ at which repetitive firing occurs and ISR had been found to be pronounced, some of the properties of the corresponding stable equilibrium point are found. A linearized approximation around this point has oscillatory solutions from whose maxima spikes tend to occur. A one dimensional diffusion is also constructed for small noise based on the correlations between the pairs of HH variables and the small magnitudes of the fluctuations in two of them. Properties of the basin of attraction of the limit cycle (spike) are investigated heuristically and also the nature of distribution of spikes at very small noise corresponding to trajectories which do not ever enter the basin of attraction of the equilibrium point. Long term trials of duration 500000 ms are carried out for values of the noise parameter $σ$ from 0 to 2.0, with results appearing in Section 3. The graph of mean spike count versus $σ$ is divided into 4 regions $R_1,...,R_4,$ where $R_3$ contains the minimum associated with ISR.

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