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. 2018 Nov 20;9:2117. doi: 10.3389/fpsyg.2018.02117

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Copyright © 2018 Sliva, Black, Bowary, Agrawal, Santoyo, Philip, Greenberg, Moore and Jones.

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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Mean pre-stimulus alpha power is not different before and after tACS. (A) Power spectral density (PSD) plots show mean time–frequency representation (TFR) values (±SEM) over the 1 s time period prior to delivery of the tactile stimulus (–1–0 s), averaged across participants, for frequencies within the alpha range (individual peak frequencies between 7–14 ± 2 Hz). (B) Normalized pre-stimulus alpha power averaged across the pre-stimulus time period is shown for individual subjects (black circles), and averaged within groups (red circles), before and after sham and alpha tACS. Mean pre-stimulus alpha power did not differ significantly within groups (pre- vs. post-) for alpha or sham tACS groups (n = 6/group, Wilcoxon signed ranks test, p > 0.05). There were also no significant differences in mean pre-stimulus alpha power between groups (sham vs. alpha) before or after tACS (Mann–Whitney U test, p > 0.05).