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. 2022 Jun 27;16:870758. doi: 10.3389/fnins.2022.870758

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Copyright © 2022 Steinmann, Williams, Wilke and Antal.

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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EEG and fMRI data were simultaneously recorded during three runs (pre, stimulation, post), while subjects passively watched the same video each run. During the second run (stimulation), subjects received a continuous stimulation at their IAF (tACS-session) or only a 10-s ramp-up/ramp-down stimulation (sham-session). The tACS electrodes were placed at PO7/PO8 positions, and the EEG was recorded from 31 electrodes. After the experiment, subjects retrospectively rated their sleepiness during each run on a continuous line ranging from sleepy to very awake.