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arXiv 2011.14731q-bio.NCnlin.AO
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慢波睡眠全脑模型中适应诱导慢振荡的时空模式

Spatiotemporal patterns of adaptation-induced slow oscillations in a whole-brain model of slow-wave sleep

Caglar Cakan, Cristiana Dimulescu, Liliia Khakimova, Daniela Obst, Agnes Flöel, Klaus Obermayer

摘要:

在慢波睡眠期间,大脑处于一种自组织状态,在这种状态下,向上和向下状态之间的慢振荡(SO)穿过皮层。虽然一个孤立的皮质片可以产生SO,但这些振荡的全脑传播被认为是由长距离轴突连接介导的。我们解决的机制,如何SO出现和招聘大部分的大脑使用全脑模型构建的经验连接数据,其中SO独立诱导在每个大脑区域的本地适应机制。使用进化优化方法,很好地适合人类静息状态的功能磁共振成像数据和睡眠脑电图数据被发现在接近分叉的适应强度的值,该模型产生的平衡与现实的时空统计本地和全球SO。局部振荡更频繁,持续时间更短,振幅更低。全球振荡作为沉默的波在大脑中传播,从前部到后部区域。这些行波是由大脑网络中的异质性引起的,其中大脑区域之间的连接强度决定了哪些区域首先过渡到下降状态,从而启动了穿越皮层的行波。我们的研究结果证明了全脑模型的效用,用于解释大规模皮层振荡的起源以及它们是如何由连接体塑造的。

英文摘要:

During slow-wave sleep, the brain is in a self-organized regime in which slow oscillations (SOs) between up- and down-states travel across the cortex. While an isolated piece of cortex can produce SOs, the brain-wide propagation of these oscillations are thought to be mediated by the long-range axonal connections. We address the mechanism of how SOs emerge and recruit large parts of the brain using a whole-brain model constructed from empirical connectivity data in which SOs are induced independently in each brain area by a local adaptation mechanism. Using an evolutionary optimization approach, good fits to human resting-state fMRI data and sleep EEG data are found at values of the adaptation strength close to a bifurcation where the model produces a balance between local and global SOs with realistic spatiotemporal statistics. Local oscillations are more frequent, last shorter, and have a lower amplitude. Global oscillations spread as waves of silence across the brain, traveling from anterior to posterior regions. These traveling waves are caused by heterogeneities in the brain network in which the connection strengths between brain areas determine which areas transition to a down-state first, and thus initiate traveling waves across the cortex. Our results demonstrate the utility of whole-brain models for explaining the origin of large-scale cortical oscillations and how they are shaped by the connectome.

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