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. 2020 Nov 18;10:20111. doi: 10.1038/s41598-020-77111-0

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© The Author(s) 2020

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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Mean GABA/Glu ratio after anodal and cathodal stimulation. The graph shows a significant increase of GABA/Glu ratio after anodal stimulation during the second post-tDCS measurements and a significant increase of GABA/Glu ratio after cathodal stimulation during the third post-tDCS measurements with respect to the baseline condition (*p < 0.05). Error bars reflect standard error of the mean. N = 21.