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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. 6 — Amplitude spectra for unfiltered EyeLink 1000 Plus data. Recordings made with SR EyeLink 1000 Plus with its heuristic filter turned off and recording from human eyes (left column) and artificial eyes (right column). Artificial eye data now exhibit a flat amplitude spectrum (white signal). The slope for data recorded from humans has become much shallower than when recording with the filter switched on, as shown in Fig. 5, but still exhibits some color. 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