arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.10642q-bio.NCphysics.bio-ph
收藏

人类癫痫发作前皮层单神经元活动的临界性评估

Assessing criticality in pre-seizure single-neuron activity of human epileptic cortex

Annika Hagemann, Jens Wilting, Bita Samimizad, Florian Mormann, Viola Priesemann

摘要:

癫痫发作的特征是异常和过度的神经活动,其中皮质网络动力学似乎变得不稳定。然而,大多数时候,在无癫痫期,癫痫患者的皮层表现出完全稳定的动力学。这就提出了一个问题,即在这种稳定的违约状态下,反复出现的不稳定是如何产生的。在这项工作中,我们研究了两种潜在的癫痫发作的情况:(i)癫痫皮质区通常可能更接近不稳定,这将使癫痫患者更容易发生癫痫发作,或(ii)癫痫皮质区可能在癫痫发作前系统地向不稳定方向漂移。我们分析了20例癫痫患者的致痫性(局灶性)和非局灶性皮质半球的单单位锋电位记录。我们量化的距离不稳定的临界性的框架中,使用一种新的估计,这使得一个无偏的推断,从一个小的记录神经元。令人惊讶的是,我们没有发现这两种情况的证据:病灶区通常不接近不稳定,癫痫发作之前也没有向不稳定漂移。事实上,我们从癫痫发作前和无癫痫发作间隔的结果表明,尽管有癫痫,人类大脑皮层仍在稳定的、稍微亚临界的状态下运行,就像其他健康的人一样。

英文摘要:

Epileptic seizures are characterized by abnormal and excessive neural activity, where cortical network dynamics seem to become unstable. However, most of the time, during seizure-free periods, cortex of epilepsy patients shows perfectly stable dynamics. This raises the question of how recurring instability can arise in the light of this stable default state. In this work, we examine two potential scenarios of seizure generation: (i) epileptic cortical areas might generally operate closer to instability, which would make epilepsy patients generally more susceptible to seizures, or (ii) epileptic cortical areas might drift systematically towards instability before seizure onset. We analyzed single-unit spike recordings from both the epileptogenic (focal) and the nonfocal cortical hemispheres of 20 epilepsy patients. We quantified the distance to instability in the framework of criticality, using a novel estimator, which enables an unbiased inference from a small set of recorded neurons. Surprisingly, we found no evidence for either scenario: Neither did focal areas generally operate closer to instability, nor were seizures preceded by a drift towards instability. In fact, our results from both pre-seizure and seizure-free intervals suggest that despite epilepsy, human cortex operates in the stable, slightly subcritical regime, just like cortex of other healthy mammalians.

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。

↑