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. 2020 Mar 3;52(5):1970–1979. doi: 10.3758/s13428-020-01358-8

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© The Author(s) 2020

Open AccessThis 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. 4 — Setup and calibration interface when using a separate operator screen. Top panel: simplified setup screen shown to the participant when a separate operator screen is available (cf. Fig. 2). Bottom panel: operator view during calibration and validation. The fixation target that is currently shown to the participant is highlighted with a red circle, gaze data from the last 500 ms is shown for the two eyes (groups of blue and orange dots) and the eye images provided by the eye tracker are also shown if available (the images in this figure were acquired with a Tobii Pro Spectrum)