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. 2020 Sep 24;10:15718. doi: 10.1038/s41598-020-72954-z

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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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Effect of background luminance on pupillary responses associated with emotional arousal. Pupil dynamics following emotional sounds in different arousal conditions on dark (A) and, bright (B) backgrounds (n = 23). Mean pupil size (2000 to 6000 ms) (C) and time to peak dilation (D) of pupillary responses can be seen in different arousal conditions with dark and bright backgrounds. In A and B the shaded colored regions surrounding the pupillary response curves represent the ± standard error range (across participants) for different conditions. In C and D, the large-circle and error-bars represent the mean values ± standard error across participants. The small circles represent mean value for each participant. *Indicates differences are statistically significant.