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. 2018 Jan 10;8:317. doi: 10.1038/s41598-017-18741-9

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Emotion judgment. (A) Task. Subjects viewed a face for 1 second and reported their emotion judgment (fearful or happy). Following emotion judgment, subjects also reported their confidence in emotion judgment (‘1’ for ‘very sure’, ‘2’ for ‘sure’ or ‘3’ for ‘unsure’). (B) Example faces from a female face model. Face stimuli were constructed from⁴⁴. (C) Psychometric curves for large vs. small faces. Shaded area denotes one SEM across subjects. The top green bar illustrates the points with significant difference between large vs. small faces (paired two-tailed t-test, P < 0.05, FDR corrected). (D) Index for emotion judgment bias (x _half). (E) Index for emotion judgment sensitivity and specificity (α). Asterisks indicate significant difference using two-tailed paired t-test. *P < 0.05, and **P < 0.01.