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. 2021 May 7;12:659121. doi: 10.3389/fpsyt.2021.659121

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Copyright © 2021 Oh, Jung, Kim, Shim and Kwon.

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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An example of stimuli used for the mental rotation (MR) task. Participants performed a block-designed MR task with two conditions: (A) an MR condition and (B) a zero rotation (ZR) condition as a control condition. For the MR condition, stimuli were rotated by four different angles (40, 80, 120, and 160 degrees), and these rotated characters were mirrored. For the ZR condition, only the characters generated by mirroring the image along the horizontal plane of the picture without any rotation (0 degrees) were used.