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. 2019 Mar 27;9:5255. doi: 10.1038/s41598-019-41658-4

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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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Relationship between scene luminance (range 0–255, see methods) and pupil diameter. (a) Phasic pupil responses (z-seconds) for scenes of varying luminance when paired with a target or distractor tone. (b) Starting pupil diameter (z) for scenes of luminance when paired with a target or distractor tone. For both panels, separate regression lines are included for target- and distractor-paired scenes. The r values indicate the Pearson correlation between the pupil measures and scene luminance in the target and distractor conditions. ** indicates correlations that are significant at p < 0.01 with 214 degrees of freedom.