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. 2019 Jul 11;10:1610. doi: 10.3389/fpsyg.2019.01610

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Copyright © 2019 Mei, Chen and Dong.

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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The trial procedure of Experiment 2. In each trial, the first facial expression was presented for 1000 ms, followed by a 50 ms or a 2500 ms noise mask 1. These two various durations were counterbalanced across sessions. After a 250 ms fixation cross, the second facial expression was presented for 500 ms, followed by a 1000 ms noise mask 2. Then the question “which facial expression was more happy” appeared until participants made a response by pressing “1” or “2.” The next trial started after a 3200 ms or a 750 ms intertrial interval, depending on the corresponding delay durations of noise mask 1.