Characterizing sleep stages through the complexity-entropy plane in human intracranial data and in a whole-brain model
Characterizing the brain dynamics during different cortical states can reveal valuable information about its patterns across various cognitive processes. Studying the differences between awake and sleep stages can shed light on the understanding of brain processes essential, such as memory consolidation, information processing, and fatigue recovery. Alterations in these patterns may indicate disorders and pathologies such as obstructive sleep apnea, narcolepsy, as well as Alzheimer's and Parkinson's diseases. Here, we analyze time series obtained from intracranial recordings of 106 patients, covering four sleep stages: Wake, N2, N3, and REM. Intracranial electroencephalography represents the state-of-the-art measurements of brain activity. We characterize the signals using Bandt and Pompe symbolic methodology to calculate the Weighted Permutation Entropy and the Statistical Complexity Measure based on the Jensen and Shannon disequilibrium. By mapping the data onto the complexity-entropy plane, we observe that each stage occupies a distinct region, revealing its own dynamic signature. We show that our empirical results can be reproduced by a whole-brain computational model, in which each cortical region is described by a mean-field formulation based on networks of Adaptive Exponential Integrate-and-Fire neurons. Finally, we show that a classification approach using Support Vector Machine (SVM) provides high accuracy in distinguishing between cortical states.
This Annual PhD student seminar will be broadcasted in the following zoom link: https://us06web.zoom.us/j/89466064429?pwd=po9p99eAEYVPaNI8xIIGoOIz0hOqaF.1
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