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. 2020 Feb 13;10:2608. doi: 10.1038/s41598-020-59415-3

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© The Author(s) 2020

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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Pupillometry measures: (a) Mean pupil dilation (in millimetres) across the time course of the trial (in milliseconds), stimulus-locked to the onset of the cue (zero point in time), and separately for the different conditions (incentive condition: reward vs. control; four ratio conditions); arrow at the top indicates the associated phase of the trial; (b) mean and standard error (SE) for the pupil dilation (in millimetres) measured at the peak of the pupil response during reward anticipation (cue phase; left), numerosity discrimination (stimulus phase; middle), and feedback processing (feedback phase; right), separately for the two incentive conditions and the four ratio conditions.