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arXiv 2109.06757math.DSnlin.AO
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具有突触动力学的下一代神经块模型中的爆发:一种慢-快方法

Bursting in a next generation neural mass model with synaptic dynamics: a slow-fast approach

Halgurd Taher, Daniele Avitabile, Mathieu Desroches

摘要:

我们报告了一个详细的分析爆裂的出现在最近开发的神经质量模型,考虑到短期突触可塑性。这里使用的一个是特别重要的,因为它代表了一个精确的平均场限制的突触耦合二次积分和消防神经元,一个典型的模型I型兴奋性。在缺乏突触动力学的情况下,具有低频率ε的周期性外部电流可以导致突发样动力学。使用奇异扰动理论的技术,特别是慢-快解剖,可以理解发射模式。在具有突触动力学的模型中,时间尺度的分离导致了各种各样的慢-快现象,并且它们在爆发中的作用变得异常复杂。鸭翼是一个主要的慢-快元素的路线爆裂。它们描述了附近的轨迹演变,否则排斥本地不变的系统集,并发现在过渡区从亚阈值动态爆发。对于奇异极限ε = 0附近的时间尺度分离值,我们报告了特殊的跳跃鸭翼,它阻止了向爆发的连续过渡。在生物学上更合理的ε机制中,这种转变变得连续,并且通过连续的尖峰增加转变出现爆发。爆发的开始是复杂的性质,并涉及混合型像环面鸭,形成的第一个尖峰的爆发和附近的快速子系统排斥极限环旋转。我们提供了数字证据,同样的机制是负责出现的二次整合和消防网络与塑料突触的爆裂。由于平均场极限的精确性,主要结论适用于网络。

英文摘要:

We report a detailed analysis on the emergence of bursting in a recently developed neural mass model that takes short-term synaptic plasticity into account. The one being used here is particularly important, as it represents an exact meanfield limit of synaptically coupled quadratic integrate & fire neurons, a canonical model for type I excitability. In absence of synaptic dynamics, a periodic external current with a slow frequency ε can lead to burst-like dynamics. The firing patterns can be understood using techniques of singular perturbation theory, specifically slow-fast dissection. In the model with synaptic dynamics the separation of timescales leads to a variety of slow-fast phenomena and their role for bursting is rendered inordinately more intricate. Canards are one of the main slow-fast elements on the route to bursting. They describe trajectories evolving nearby otherwise repelling locally invariant sets of the system and are found in the transition region from subthreshold dynamics to bursting. For values of the timescale separation nearby the singular limit ε = 0, we report peculiar jump-on canards, which block a continuous transition to bursting. In the biologically more plausible regime of ε this transition becomes continuous and bursts emerge via consecutive spike-adding transitions. The onset of bursting is of complex nature and involves mixed-type like torus canards, which form the very first spikes of the burst and revolve nearby fast-subsystem repelling limit cycles. We provide numerical evidence for the same mechanisms to be responsible for the emergence of bursting in the quadratic integrate & fire network with plastic synapses. The main conclusions apply for the network, owing to the exactness of the meanfield limit.

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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