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. 2018 Oct 31;9:2080. doi: 10.3389/fpsyg.2018.02080

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Copyright © 2018 Liu, Zhao, Wang and Zhang.

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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Typical psychometric functions in Experiment 2. The functions in the random group are presented on the left. The functions in the regular group are presented on the right. In each group, filled rectangles, dark-blue curve = treatments with an unconnected reference and without an adaptor; open rectangles, green curve = treatments with an unconnected reference and with an adaptor; filled circles, red curve = treatments with a connected reference and without an adaptor; open circles, light-blue curve = treatments with a connected reference and with an adaptor.