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. 2022 Mar 14;5:230. doi: 10.1038/s42003-022-03173-7

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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. 7 — a Experimental procedure and stimuli of the ERP study. EEG recordings were acquired from preschool children while they watched photographs of the faces of their peers (with representative images for dominant, neutral, and subordinate facial expressions). The photograph of the child is used with the consent of the parents. b Grand-mean ERP difference waveforms of FN400 in the FCz channel in response to dominant and subordinate faces in 1^st- and 4^th-rank children (n = 12 pairs). c The difference wave amplitudes of FN400 in response to dominant and subordinate faces in 1^st- and 4^th-rank children (two-way ANOVA, n = 12 pairs). Note. The FN400 amplitudes of each facial expression were corrected by subtracting the averaged amplitude of the neutral facial condition. Error bars = SEM.