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. 2020 Mar 23;52(5):2098–2121. doi: 10.3758/s13428-020-01363-x

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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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Fig. 7 — The green CR and blue Pupil signals of the SMI HiSpeed240 during a smooth 19. 5^∘ continuous sweep for 60 seconds. The CR is shifted in time for visibility. Note how clean the pupil signal is (representing the smooth rotation of the Stepperbox), and how jagged the CR signal is (a repeating artefact). Also note how the artefacts in the CR signal are mirrored in the turning points. Inlaid is the eye video of the HiSpeed240 with the SR Research artificial eye. Here, the pupil diameter spans 77 pixels, while the CR diameter spans approximately 8 pixels, which are common sizes for high-end eye-trackers.