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. 2020 Apr 24;10:6971. doi: 10.1038/s41598-020-63884-x

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© The Author(s) 2020

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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Significant positive relationship between expert ratings of primate-typical tolerance for eye contact and the more stratified or affiliative attributes of their social relationships (hierarchical versus more egalitarian). On the x-axis, a 0 (completely hierarchical) to 100 (completely egalitarian) scale of primate social structure. On the y-axis, a 0 (no tolerance) to 100 (high tolerance) scale of primate eye contact tolerance. This figure is generated from a data set consisting of 55 data points. For the sake of interpretability, these 55 data points have been collapsed into the shown 19 data points. Each point represents a specific grouping of primates as indicated by their labeling.