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. 2021 Feb 4;11:3123. doi: 10.1038/s41598-021-82364-4

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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ERSP analysis of the induced activity. (A–C) (Upper row) ERSP obtained for the 20 min before stimulation (PRE, first column), during tDCS (DURING, second column), the first 20 min after tDCS cessation (POST1, third column) and the next 20 min (POST2, fourth column) for cathodal (A), anodal (B) or sham (C) tDCS. (Lower row) Differences between the ERSP obtained in the 20 min before stimulation (PRE) and DURING (first column), POST1 (second column) or POST2 (third column) for cathodal (A), anodal (B) or sham (C) tDCS. Black outline represents statistical differences for that frequency and time range (p < 0.05, permutations).