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. 2019 Jul 9;13:222. doi: 10.3389/fnhum.2019.00222

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Copyright © 2019 Kress and Aue.

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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Change in positive and negative mood from baseline to after two training weeks in the experimental/control group. Error bars depict standard errors. (A) Positive mood does not change over the 2-week training period in the experimental or control group. (B) Negative mood does not change over the 2-week training period in the experimental or control group.