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. 2019 Feb 26;9:2778. doi: 10.1038/s41598-019-39155-9

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© The Author(s) 2019

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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Effect of age and testing sequence on boldness (N = 105 and 106 for the first and second trial, respectively). Circles show observed age- and trial-specific boldness (mean ± SE) and lines represent predicted values based on the final model. Filled circles and the solid line refer to the first trial; open circles and the dashed line to the second trial. Points were slightly jittered with regard to age. The two points for which standard error is not provided are those with N = 1.