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. 2018 Aug 21;8:12499. doi: 10.1038/s41598-018-30414-9

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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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Decisional signal dynamics during simultaneity judgment. (a) Amplitude of the centro-parietal positivity (CPP) derived from single trial EEG and pooled across all 7 SOAs and all participants. The dotted line indicates stimulus onset, while the sigmoidal solid line indicates response times for individual trials. Data were sorted by response time and vertically smoothed with a 300 trial Gaussian moving average. (b) CPP calculated separately for each of the 7 SOAs. The dashed line at bottom indicates the time window used for slope analysis (−500 to −50 ms relative to response; see panel c). Solid black line indicates time points with a significant difference in voltage (repeated measures multivariate F test at each time point; cluster p = 0.0003, randomization test). Top bar indicates the time region averaged for CPP topography (−50 to 0 ms relative to response), which is shown in the inset and averaged across all 7 SOAs. (c) Linear CPP slope for all 7 SOAs. Error bars indicate standard error of the mean. Slope was calculated in the dashed region in panel B.