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. 2021 Feb 11;15:618408. doi: 10.3389/fnbot.2021.618408

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Copyright © 2021 Ren, Li, Chen, Zhang, Ma, Wang, Lin and Zhang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Power spectral density (PSD) distributions of EEG signals for subjects 1 and 3. (A) PSD distributions of the alpha band of EEG signals in the alert state (a1) and in the fatigue state (a2). PSD distributions of the whole band of EEG signals in the alert state (a3) and in the fatigue state (a4) for subject 1. (B) PSD distributions of the alpha band of EEG signals in the alert state (b1) and in the fatigue state (b2). PSD distributions of the whole band of EEG signals in the alert state (b3) and in the fatigue state (b4) for subject 3.