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. 2018 Sep 3;8:13165. doi: 10.1038/s41598-018-31551-x

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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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Stimulus-locked pupil data. (A) Changes in pupil diameter for constant brightness condition (light gray), reduced brightness condition (black), Go- (green), and NoGo-condition (orange). (B) Pupil diameter for target-trials (blue) and distractor-trials (red) show that pupil always responded stronger when targets were present. This effect could be monitored under both brightness conditions (upper four lines: reduced brightness) and irrespective of the Go/NoGo task (Go: solid lines, NoGo: dotted lines). (C–F) Differences between target and distractor together with functional confidence intervals. If zero is not contained in the CI, changes are significantly different to a FDR-corrected α = 0.05. All conditions showed clearly significant differences between target- and distractor-trials. (C) Constant brightness, NoGo. (D) Constant brightness, Go. (E) Reduced brightness, NoGo. (F) Reduced brightness, Go.