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. 2019 Mar 5;9:106. doi: 10.1038/s41398-019-0439-0

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Stimulation configuration for all participants. Two stimulators were used; one connected to the electrode over F3, one connected to the electrode over F4, and both connected to the electrode over Cz. The red electrodes (F3 and F4) are the anode and the blue return electrode over Cz is the cathode. b Sham and active stimulation paradigms. Ramp-in and ramp-out is 20 s for all conditions, with 40 s of active stimulation for Sham stimulation, 2400 s of active stimulation for 10 Hz-tACS and 40 Hz-tACS. Anodes (F3 and F4) and cathode (Cz) are at opposite phase at any given point during stimulation. c Electric field simulation: 2D (top) and 3D (bottom) representation (HD-Explore, Soterix Medical, New York, NY, USA)