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arXiv 1410.3263math.PR
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关于交互神经元的玩具模型

On a toy model of interacting neurons

Nicolas Fournier, Eva Löcherbach

摘要:

我们继续研究De Masi-Galves-Löcherbach-Presutti(2014)中介绍的相互作用神经元的随机系统。该系统由N个神经元组成,每个神经元随机地以取决于其膜电位的速率尖峰。在其尖峰时刻,神经元电位被重置为0,并且所有其他神经元接收额外量的1/N电位。此外,电突触诱导系统向其质心的确定性漂移。我们证明了当N趋于无穷大时,系统的混沌传播到一个极限非线性跳跃随机微分方程。因此,我们改进了De Masi-Galves-Löcherbach-Presutti(2014)的结果,因为(i)我们去除了初始数据上的紧支撑条件,(ii)我们得到了$1/\sqrt N$收敛速率。最后,我们研究了极限方程:我们描述了它的时间边缘的形状,我们证明了唯一的非平凡不变分布的存在性,我们证明了平凡不变分布是不吸引的,并且在一个特殊的情况下,我们建立了收敛到平衡点。

英文摘要:

We continue the study of a stochastic system of interacting neurons introduced in De Masi-Galves-Löcherbach-Presutti (2014). The system consists of N neurons, each spiking randomly with rate depending on its membrane potential. At its spiking time, the neuron potential is reset to 0 and all other neurons receive an additional amount 1/N of potential. Moreover, electrical synapses induce a deterministic drift of the system towards its center of mass. We prove propagation of chaos of the system, as N tends to infinity, to a limit nonlinear jumping stochastic differential equation. We consequently improve on the results of De Masi-Galves-Löcherbach-Presutti (2014), since (i) we remove the compact support condition on the initial datum, (ii) we get a rate of convergence in $1/\sqrt N$. Finally, we study the limit equation: we describe the shape of its time-marginals, we prove the existence of a unique non-trivial invariant distribution, we show that the trivial invariant distribution is not attractive, and in a special case, we establish the convergence to equilibrium.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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