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arXiv 2203.08341q-bio.NCmath.DS
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自适应脉冲神经网络的精确平均场模型

Exact mean-field models for spiking neural networks with adaptation

Liang Chen, Sue Ann Campbell

摘要:

具有适应性的尖峰神经元网络已被证明能够再现广泛的神经活动,包括支持大脑紊乱和正常功能的突发群体爆发和尖峰同步。从尖峰神经网络导出的精确平均场模型是非常有价值的,因为这样的模型可以用于确定单个神经元和网络参数如何相互作用以产生宏观网络行为。本文推导并分析了具有尖峰频率自适应的神经网络的精确平均场方程。具体来说,我们的模型是一个网络的Izhikevich神经元,其中每个神经元是由一个二维系统,包括一个二次积分和消防方程加上一个方程,实现尖峰频率自适应。以前的工作推导出这种类型的网络的平均场模型,依赖于假设足够慢的动态的适应变量。然而,这种近似并没有成功地在宏观描述和现实神经网络之间建立精确的对应关系,特别是当适应时间常数不大时。挑战在于如何实现一个封闭的一组平均场方程,包括适应变量的平均场表达式。我们解决这个挑战,通过使用一个Lorentzian anomaly结合矩封闭的方法来达到在热力学极限的平均场系统。所得到的宏观描述能够定性和定量地描述神经网络的集体动力学,包括紧张性放电和爆发之间的过渡。

英文摘要:

Networks of spiking neurons with adaption have been shown to be able to reproduce a wide range of neural activities, including the emergent population bursting and spike synchrony that underpin brain disorders and normal function. Exact mean-field models derived from spiking neural networks are extremely valuable, as such models can be used to determine how individual neuron and network parameters interact to produce macroscopic network behaviour. In the paper, we derive and analyze a set of exact mean-field equations for the neural network with spike frequency adaptation. Specifically, our model is a network of Izhikevich neurons, where each neuron is modeled by a two dimensional system consisting of a quadratic integrate and fire equation plus an equation which implements spike frequency adaptation. Previous work deriving a mean-field model for this type of network, relied on the assumption of sufficiently slow dynamics of the adaptation variable. However, this approximation did not succeeded in establishing an exact correspondence between the macroscopic description and the realistic neural network, especially when the adaptation time constant was not large. The challenge lies in how to achieve a closed set of mean-field equations with the inclusion of the mean-field expression of the adaptation variable. We address this challenge by using a Lorentzian ansatz combined with the moment closure approach to arrive at the mean-field system in the thermodynamic limit. The resulting macroscopic description is capable of qualitatively and quantitatively describing the collective dynamics of the neural network, including transition between tonic firing and bursting.

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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