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. 2014 Mar 12;13:28. doi: 10.1186/1475-925X-13-28

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Copyright © 2014 Cao et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Comparison of Raw EEG signal and the spectrum of an individual participant between the alert and fatigue states for Experiment 1. Vertical axis for (a) and (b), amplitude (μV); horizontal axis for (a), time (sec); horizontal axis for (b), frequency (Hz); red curve: alert state; blue curve: fatigue state.