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. 2018 Nov 14;9:2217. doi: 10.3389/fpsyg.2018.02217

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Copyright © 2018 Chapagain, Virányi, Huber, Serra, Schoesswender and Range.

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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Different stimuli used in the various phases: (A) Approach training stimuli (phase 1), (B,C) Pre-training stimuli (phase 2): Geometric form (B) and Picture discrimination task (C), (D,E) Picture discrimination (phase 3): 4 vs. 4 stimuli (D), 2 vs. 2 stimuli (E), (F) Main discrimination task (phase 4).