Sleep unconsciousness and breakdown of serial critical intermittency: New vistas on the global workspace
Sleep unconsciousness and breakdown of serial critical intermittency: New vistas on the global workspace
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DOI：
10.1016/j.chaos.2013.05.019
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发表时间：
2013-10-01
影响因子：
7.8
通讯作者：
Gemignani, Angelo
中科院分区：
文献类型：
--
作者：
Allegrini, Paolo;Paradisi, Paolo;Gemignani, Angelo
虽然几种心理功能的特点是通过皮层中的模数进行并行计算，但意识是通过串行全局整合来维持的：每次发生一个场景。对复杂系统的研究表明，当系统处于“临界”状态时，包含多个组分活动的宏观变量会发生具有间歇性序列结构的波动，其特征是大小和事件间隔时间密度呈反幂律（无标度）分布的雪崩。在清醒状态下的人脑动力学中已经确立了临界性。在这里，我们回顾了批判性假设是如何能够解释许多最近的研究大脑复杂的动力学。我们的重点，特别是全球性的，串行的，间歇性的行为，可以通过高密度脑电图评估，研究亚稳态之间的转换。虽然在清醒状态下已经建立，但这种全球间歇性动态是否与意识或非任务驱动的默认模式相关仍然没有解决，这种默认模式也存在于无意识状态，如深度（NREM）睡眠。在这里，我们表明，在非快速眼动睡眠的序列性打破，并重新建立在快速眼动睡眠（梦），与不变的空间结构，在复杂的分支雪崩。我们推测，这种连通性是利用在NREM睡眠神经双稳态，重置和“并行化”部分皮层。(C)2013爱思唯尔有限公司保留所有权利。
While several mental functions are characterized by parallel computation performed by moduli in the cortex, consciousness is sustained by a serial global integration: a single scene at a time takes place. Studies on complex systems show that macroscopic variables, integrating many components activities, undergo fluctuations with an intermittent serial structure when the system is in a state called "criticality", characterized by avalanches with inverse-power-law (scale-free) distribution densities of sizes and inter-event times. Criticality has been established in human brain dynamics during wakefulness. Here we review how the critical hypothesis is able to explain many recent studies on brain complex dynamics. We focus, in particular, on the global, serial, intermittent behavior that can be assessed via high-density electroencephalograms, studying transitions between metastable states. Established as it is during wakefulness, it remained unsolved whether this global intermittent dynamics correlates with consciousness or with a non-task-driven default mode, also present in non-conscious states, like deep (NREM) sleep. Here we show that in NREM sleep seriality breaks down, and re-establishes during REM sleep (dreams), with unaltered spacial structure, in terms of complex branching of avalanches. We conjecture that this connectivity is exploited in NREM sleep by neural bistability, resetting and "parallelizing" portions of the cortex. (C) 2013 Elsevier Ltd. All rights reserved.