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. 2022 Jul 27;5:749. doi: 10.1038/s42003-022-03711-3

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© The Author(s) 2022

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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Fig. 8 — Curvature was measured by aspect ratio, which showed no significant correlation with either objects’ size (a) or PC2 (b). c The size axis (PC2) was not sensitive to the size of animals (t = 1.78, p = 0.08). d Instead, the feature of animacy was apparently encoded in the first principal component (PC1) of the object space, as the values of PC1 distinguished animacy from artifacts (t = 13.05, p < 0.001). ***p < 0.001; n.s. not significant.