Low frequency oscillations drive EEG's complexity changes during wakefulness and sleep

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作   者：

Gonzalez, Joaquin;  Mateos, Diego;  Cavelli, Matias;  Mondino, Alejandra;  Pascovich, Claudia;  Torterolo, Pablo;  Rubido, Nicolas; 

作者机构：

Consejo Nacl Invest Cient & Tecn;  Inst Complex Syst & Math Biol;  Univ Republica;  Dept Fisiol;  Univ Aberdeen; 

关键词：

sleep-wake cycle;  PERMUTATION ENTROPY;  GAMMA;  CONSCIOUSNESS;  EEG;  INFORMATION;  WAKING;  DISCHARGE;  WAVES;  HZ;  DYNAMICS;  NEURONS;  low frequency oscillations; 

期刊名称：

Neuroscience: An International Journal under the Editorial Direction of IBRO

i s s n：

0306-4522

年卷期：

2022 年 494 卷

页   码：

1-11

页   码：

摘   要：

the sleep-wake states have been analysed using novel complexity measures, complementing the classical analysis of EEGs by frequency bands. This new approach consistently shows a decrease in EEG's complexity during slow-wave sleep, yet it is unclear how cortical oscillations shape these complexity variations. In this work, we analyse how the frequency content of brain signals affects the complexity estimates in freely moving rats. We find that the low-frequency spectrum - including the Delta, Theta, and Sigma frequency bands - drives the complexity changes during the sleep-wake states. This happens because low-frequency oscillations emerge from neuronal population patterns, as we show by recovering the complexity variations during the sleep-wake cycle from micro, meso, and macroscopic recordings. Moreover, we find that the lower frequencies reveal synchronisation patterns across the neocortex, such as a sensory-motor decoupling that happens during REM sleep. Overall, our works shows that EEG's low frequencies are critical in shaping the sleep-wake states' complexity across cortical scales. (c) 2022 The Authors. Published by Elsevier Ltd on behalf of IBRO. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).