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. 2021 Feb 3;14:605190. doi: 10.3389/fnhum.2020.605190

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Copyright © 2021 Schommartz, Dix, Passow and Li.

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) and the copyright owner(s) 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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Scatterplot showing the relations between the upregulation of the hemodynamic response (β values) between the two experimental conditions (delayed–immediate reward; Del-Imm) and response times in milliseconds (ms) in the delayed reward condition. Correlation including regression lines with Pearson's correlation coefficient (R), p-value (*p < 0.05), and confidence region (95%; gray area are separately shown for participants, who received sham stimulation (sham; left panel) and bilateral active transcranial direct current stimulation (tDCS; right panel).