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. 2016 Jun 6;10:270. doi: 10.3389/fnhum.2016.00270

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Copyright © 2016 Boonstra, Nikolin, Meisener, Martin and Loo.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor 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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Relationship between subjective ratings of their physiological state and the EEG mean frequency. (A) Violin plot of subjective ratings of sleepiness, alertness and vigor before and after active tDCS and sham. Note, that polarity of sleepiness is reversed such that a higher rating means one is less sleepy. Yellow circles depict the median across participants and asterisks changes that are statistically significant (P < 0.05). (B) Relationship between changes in EEG mean frequency (on x-axis) and changes in subjective ratings of participant’s physiological state (y-axis). Changes are computed as post minus pre. Data for each participant are shown as red circles in active tDCS and blue asterisks for sham tDCS.