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. 2018 Oct 4;8:14791. doi: 10.1038/s41598-018-32868-3

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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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Proportion of correct responses as a function of age for boys and girls. Each dot represents the performance of one participant. The graph is centered on the mean age of the developmental sample (11.8 years) The lines represent the predicted performances as a function of age for males and females separately for the model: Response ~age + age² + 1|Subject (from the function sjp.glmer; Lüdecke D (2017). sjPlot: Data Visualization for Statistics in Social Science. R package version 2.4.0, https://CRAN.R-project.org/package=sjPlot). Shaded areas represent confidence intervals. Boxplots represent median and 75 percentile in adults’ data; the black lines represent the mean performance of adults.