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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 indices of an individual participant between the alert and fatigue states for Experiment 1. Comparison of the average values and SD of fatigue score, EEG indices, ratio indices, as well as SSVEP amplitude and SNR in the alert and fatigue states. Vertical axis for (b)-(i), amplitude (μV); horizontal axis for (a)-(i), Alert: alert state, Fatigue: fatigue state.