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. 2017 Jan 24;7:41019. doi: 10.1038/srep41019

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/http://creativecommons.org/licenses/by-nc-nd/4.0/

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We computed the PSE for each facial color/expression condition to measure the shift in the psychometric function along the x-axis by facial color/expression. (A) An example is shown for fear-to-anger female face continua in used experiment 1. The x-axis shows the morph continuum and the y-axis shows the percentage of time that the participant (Subject H.N.) judged that facial expression as angry. (B) An example is shown for fear-neural-anger female face continua used in experiment 2. The x-axis shows the facial color continuum and the y-axis shows the percentage of time that the participant (Subject H. T.) judged that facial color as reddish. Color images of an emotional face were taken from the ATR Facial Expression Image Database (DB99) (ATR-Promotions, Kyoto, Japan, http://www.atr-p.com/face-db.html).