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. 2019 Sep 12;82(3):1125–1135. doi: 10.3758/s13414-019-01865-7

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© The Author(s) 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 4 — a Results from Experiment 1 showed that pupil size was related to the content of thought, with a larger tonic pupillary diameter when participants reported having task-unrelated (light-gray line) as compared to task-related (dark-gray line) thoughts. b This effect was not replicated in Experiment 2. Shaded regions around the curves indicate one standard error of the mean. The areas with gray background denote the window of interest to calculate the tonic pupillary diameter—that is, the baseline response (see Fig. 1)