Understanding the Spatio-Temporal Coupling of Spikes and Spindles in Focal Epilepsy Through a Network-Level Computational Model.

International journal of neural systems Pub Date : 2025-05-01 Epub Date: 2025-03-15 DOI:10.1142/S0129065725500182
Min Pan, Qiang Li, Jiangling Song, Bo Wang, Wenhua Wang, Rui Zhang
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Abstract

The electrophysiological findings have shown that epileptiform spikes triggering sleep spindles within 1[Formula: see text]s across multiple channels are commonly observed during sleep in focal epilepsy (FE). Such spatio-temporal couplings of spikes and spindles (STCSSs) are defined as a kind of pathological waves, and frequent emergence of them may cause the degradation of cognitive function for FE patients. However, the neural mechanisms underlying STCSSs are not well understood. To this end, this work first develops a neural mass network model for focal epilepsy (FE-NMNM) with multiple thalamocortical columns being its nodes and the long-range synaptic interactions of thalamocortical columns being its edges, where each thalamocortical column is extended on the basis of Costa model and then they are connected through excitatory synapses between pyramidal cells. Then, how the cortico-cortical connectivity affects the evolution of STCSSs across the network is especially discussed by simulations in two cases, where the inter-ictal state and the ictal state are considered separately. Simulation results demonstrate that: (1) the more STCSSs occur in a more extensive area when the cortico-cortical connectivity becomes stronger, and the significant increase of coupling discharges is attributed to the presence of abundant spikes; (2) when the connectivity is excessively strong, the cortical hyperexcitability will happen, thereby inducing massive spike discharges which may further inhibit the occurrence of spindles, and hence, resulting in the disappearance of STCSSs. The obtained results provide a mechanistic insight into STCSSs, and suggest that such coupling patterns could reflect widespread network dysfunction in FE, thereby potentially advancing therapeutic strategies for FE.

通过网络级计算模型了解局灶性癫痫中尖峰和棘波的时空耦合。
电生理学研究结果表明,在局灶性癫痫(FE)患者的睡眠过程中,通常会观察到癫痫样尖峰在1[公式:见正文]秒内触发多个通道的睡眠棘波。这种尖峰和棘波的时空耦合(STCSSs)被定义为一种病理波,频繁出现可能导致局灶性癫痫患者认知功能下降。然而,STCSSs 的神经机制尚不十分清楚。为此,本研究首先建立了一个以多个丘脑皮质柱为节点、丘脑皮质柱之间的长程突触相互作用为边缘的局灶性癫痫神经网络模型(FE-NMNM),在Costa模型的基础上对每个丘脑皮质柱进行扩展,然后通过锥体细胞之间的兴奋性突触将它们连接起来。然后,通过分别考虑发作间期和发作期两种情况的模拟,特别讨论了皮层-皮层连接如何影响整个网络中的 STCSS 演变。模拟结果表明(1)当皮层与皮层的连通性变强时,在更大范围内发生的 STCSS 越多,耦合放电的显著增加归因于大量尖峰的存在;(2)当连通性过强时,皮层过度兴奋将发生,从而诱发大量尖峰放电,这可能进一步抑制棘波的发生,从而导致 STCSS 的消失。研究结果提供了对STCSS的机理认识,并表明这种耦合模式可能反映了FE中广泛存在的网络功能障碍,从而有可能推进FE的治疗策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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