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. 2021 Jun 23;15:661432. doi: 10.3389/fnhum.2021.661432

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Copyright © 2021 Stecher, Notbohm, Kasten and Herrmann.

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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Stimulation accuracy. (A) Boxplot of Frequency Deviation [mean absolute difference between estimated stimulation frequency (ISF) of each epoch and the determined α-frequency (IAF) as per post-hoc analysis] for both the closed loop tACS and the fixed frequency tACS group. Boxes mark the ends of the 25th and the 75th percentile of the samples’ distributions, the horizontal lines mark the median of each group. The whiskers correspond to +/–2.7σ of the data. (B) Correlation between relative posterior α-power post stimulation and the mean deviation between ISF and IAF during the intermediate unstimulated-epochs. One dot represents power and frequency-deviation values of a single participant. Lines show the least-square error lines per group.