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. 2017 Jun 15;7:3607. doi: 10.1038/s41598-017-03859-7

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© The Author(s) 2017

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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(A) Experimental procedure. Measurements of resting-state fMRI and emotional state used by Positive and Negative Affect Schedule (PANAS) were conducted before and after tACS session. (B) Stimulation electrodes were placed at bilateral frontal areas (F3 and F4 in 10–20 system). (C) Emotional state change in each stimulation group. Higher values indicate positive mood. Thick and light thin lines show group averages and individual scores, respectively. Error bars denote standard error.