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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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Fixation densities as a function of stimulus level and behavioral judgment. (A) Fixation density maps for each morph level. Conventions as Fig. 3B. Face images were constructed from⁴⁴. (B) Fixation density for each morph level. (C) Fixation density for each ambiguity level. (D) Fixation density for each behavioral judgment. Error bars denote ± SEM across subjects. Asterisks indicate significant difference using two-tailed paired t-test. *P < 0.05, **P < 0.01, and ***P < 0.001.