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. 2018 Aug 17;8:12395. doi: 10.1038/s41598-018-30318-8

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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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Item-wise statistics for Study 1. Item difficulty generally increases with beep-track accuracy, excepting several outliers and a floor effect for accuracies below 0.55. (a) Success rate (averaged over all participants) as a function of beep-track accuracy or beep-track offset. Chance success rate (50%) is marked by the dashed line. The five excluded tracks are marked grey. (b) Difficulty as a function of beep-track accuracy and beep-track offset, having removed the five excluded tracks. Items with beep-track accuracies less than 0.55 are marked grey. Error bars denote one standard error. The fitted regression line is plotted with the standard error of its predictions shaded in grey.