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. 2021 Aug 3;6:53. doi: 10.1186/s41235-021-00319-9

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Sample stimuli. Top row from left to right: Baseline face (average nose and average lips); average nose and thin lips; average nose and full lips. Middle row from left to right: Thin nose and average lips; thin nose and thin lips; thin nose and full lips. Bottom row from left to right: Wide nose and average lips; wide nose and thin lips; wide nose and full lips. Each column from left to right: no reflectance, medium reflectance, high reflectance. Participants viewed full color images of the faces