By Silvia Scarpetta (University of Salerno, Italy). November 8th, 2022.
Recent experimental results and theoretical models have supported the idea that brain self-organizes to criticality , to maximize dynamical range and computational capabilities. In humans, sleep plays a crucial role to re-tune the system towards criticality . We explore neural avalanches, and the scaling relation among critical exponents, in overnight EEG recordings in human healthy subjects, during NREM sleep . Notably, the distributions of the avalanches’ size and duration, and mean size as a function of duration, are well described by a power laws with critical exponents in agreement with mean-field directed percolation class. Moreover, we study the correlation between the avalanches’ spatiotemporal structure and the sleep macro and microstructure as reflected by the CAP framework . Overall, our findings provide evidence of a link between the avalanche’s occurrence, slow-wave sleep dynamics, sleep stages transitions and CAP-phase A.
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