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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 neurotransmitter (NT) concentration after cathodal stimulation. Graph shows a significant increase of GABA concentration with respect to the Glu concentration during the third post-tDCS measurements after cathodal stimulation (*p < 0.05). RM-ANOVA revealed a non-significant trend for neurotransmitter × time point interaction only (p = 0.06). Error bars reflect standard error of the mean. N = 21.