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. 2021 Feb 9;11:3362. doi: 10.1038/s41598-021-83077-4

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© The Author(s) 2021

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 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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Heatmap of loadings for each Independent Component. Value colors represent the contribution of each facial part on independent component scores. Component 1 corresponded to raising the eyebrows (Loading mean for the center part of the right eyebrow = 2.07; Loading mean for the center part of the left eyebrow = 2.14). Component 2 is the y-movement of both eyelids (Loading mean for the upper part of the right eyelid = 2.48; Loading mean for the upper part of the left eyelid = 2.13). Component 3 represents the x-movement of the left eye and eyebrow (Loading mean for the outer part of the left eye = 2.14, Loading mean for the center part of the left eyelid = -2.07).