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. 2019 Mar 6;9:3664. doi: 10.1038/s41598-019-40281-7

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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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Results of Experiment 2. (a) Individual subjects’ psychometric function in Experiment 2A (low contrast; n = 15). The white circles represent the duration perceived as one second for each subject, and the vertical lines indicate an actual one second. (b) Individual subjects’ psychometric function in Experiment 2B (high contrast; n = 8). (c) The bars represent the population modes for the duration perceived as one second and the error bars represent 95% credible intervals. The horizontal line indicates an actual one second. The duration perceived as one second was significantly longer than an actual one second in Experiment 2A (mode = 1.29 s, 95% credible interval = [1.16, 1.44]). Similar trend was found in Experiment 2B (mode = 1.15 s, 95% credible interval = [0.96, 1.34]).