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. 2017 Sep 20;11:173. doi: 10.3389/fnbeh.2017.00173

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Copyright © 2017 Fujimoto, Tanaka, Laakso, Yamaguchi, Kon, Nakayama, Kondo and Kitada.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Grating orientation discrimination in dual-hemisphere vs. sham transcranial direct current stimulation (tDCS). The mean grating orientation threshold for each intervention is plotted as a time course with bars indicating standard error of the mean (SEM). Asterisks indicate significant differences in the threshold relative to sham control. (A) Compared with sham tDCS, Dual-Anode-Right tDCS (black circle) significantly improved the grating orientation threshold of the left finger during (During) and 10 min after the stimulation (Post 10 min). (B) Compared with sham tDCS, Dual-Anodal-Left tDCS (white circle) significantly improved the grating orientation threshold of the right finger during the stimulation. Conversely, Dual-Anodal-Right tDCS (black circle) significantly increased the grating orientation threshold during the stimulation. (C) Results of each individual participant.