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. 2020 Jul 23;53(1):311–324. doi: 10.3758/s13428-020-01414-3

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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. 7 — Amplitude spectra for gaze vector data from the SMI eye trackers. As not all filters could be turned off in the SMI RED systems, we instead analyzed the gaze vector data provided by these eye trackers for both human eyes (left column) and artificial eyes (right column). Except for the human data recorded on the SMI RED250, all gaze vector data exhibit white signal dynamics. The human gaze vector data on the SMI RED250 nonetheless exhibits amplitude spectra that are much less colored than the filtered gaze position data shown in Fig. 5. Different color lines denote different participants. Solid lines show amplitude spectra derived from horizontal gaze position data, and dotted lines for vertical gaze position data