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. 2023 Sep 14;9(1):58. doi: 10.1038/s41537-023-00388-3

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© The Author(s) 2023

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. 1 — Anger expressed with different involvement of the upper and lower face parts in an Italian poser (left panel; from Proverbio and Cerri, 2022, Front Neurosci; the Creative Commons Attribution [CC BY] license) and in a face taken from the Vienna Emotion Recognition Task, VERT-K, with subsequent modification (right panel; from Grahlow et al., 2022, PLoS ONE; the Creative Commons Attribution [CC BY] license) may lead to different conclusions by studying facial expressions under unusual viewing conditions, for example, when hidden behind a mask.