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. 2018 Feb 16;8:3200. doi: 10.1038/s41598-018-21448-0

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© The Author(s) 2018

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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Face processing among infants and adults. (A) Infants showed no significant difference in EMR when scanning different emotional faces. (B) Adults showed lower EMR approaching borderline significance in unpleasant condition. (C) Average pupil size change in infants in three emotional conditions. (D) Average pupil size change in adults in three emotional conditions. Pupil size change in neutral condition is presented in grey, unpleasant condition is presented in blue, and pleasant condition is presented in red. EMR: eye/mouth ratio. Error bars represent standard error (SEM). *P = 0.040, ^†P = 0.095.