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. 2015 Sep 2;6:1300. doi: 10.3389/fpsyg.2015.01300

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Copyright © 2015 Bai, Leib, Puri, Whitney and Peng.

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) or licensor 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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Materials and procedure for Experiment 1. (A) One hundred and forty-four faces morphed between three identities to create one wheel of 147 faces (female upright wheel presented here). In each trial, the computer randomly chose a mean face (face 30 in the figure) and 18 faces either repeating the mean 18 times (homogeneous condition) or ±5, ±15, and ±25 steps away from the mean (heterogeneous condition). (B) In the study, participants saw a crowd for 1000 ms before they were presented with a test face on the screen. Participants were asked to use the mouse to scroll through the wheel of faces and “adjust” the test face. When the adjusted test face matched with their average estimation of the previously seen crowd, they would left click their mouse and move to the next trial.