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. 2018 Oct 24;8:15692. doi: 10.1038/s41598-018-34096-1

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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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Individual-level data. Each point represents one participant’s set of mean measures for selected variables for each of the two conditions: mean measure for High Effort condition is shown on the Y axis; mean measure for Low Effort condition is shown on the X-axis. A point on the 45° line indicates equality between the two measures; that is, if the mean of each of the participant’s measures did not differ between conditions. The variables shown are calculated separately for each condition and include: (A) Mean number of coin appearances per round; (B) Mean number of key presses per round; (C) Mean round length, in seconds; (D) Mean number of key presses after the final coin appearance within a round.