Evaluating the data quality of the Gazepoint GP3 low-cost eye tracker when used independently by study participants
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Evaluating the data quality of the Gazepoint GP3 low-cost eye tracker when used independently by study participants John Brand 1 & Solomon G. Diamond 2 & Natalie Thomas 1,2 & Diane Gilbert-Diamond 1 Accepted: 17 October 2020 # The Psychonomic Society, Inc. 2020
Abstract The portability of low-cost eye trackers makes them attractive for research outside of the laboratory. Such research may require independent eye-tracker use. The present work compared the data quality of the Gazepoint GP3 when used independently by research participants with expert eye-tracking users. Twenty participants completed a training and a testing session 1 week apart. At training visits, participants were taught how to set up and use eye-tracking hardware and software and how to complete two tasks: a calibration task to measure accuracy and precision, as well as a visual search task to assess target fixations. At the testing session, participants set up the Gazepoint eye tracker and completed the two tasks without assistance. Participant accuracy and precision and visual search performance were compared to values obtained from two expert eye-tracking users. Additionally, the eye-tracker sampling rate, which is sensitive to factors such as head motion, was assessed in both participants and the expert users. Participant accuracy and precision closely approximated expert user values. Participant target fixations were detected with a 92.5% sensitivity and 76.8% specificity, closely mirroring expert user sensitivity and specificity. The sampling rate distribution was also similar between the participants and expert user (the means of those distributions were 16.99 ± 3.0 ms and 16.43 ± 2.3 ms, respectively). When used independently, data quality obtained from a low-cost, portable eye-tracking setup closely approximated values obtained from an expert user and was adequate enough to be a feasible option for some studies that require independent use by study participants. Keywords Note: This data is mandatory
Introduction Eye movement measurements are commonly used in psychological research to study cognitive processes, such as reading, scene perception, memory, and attention (Duc, Bays, Husain, Kennard, & Leigh, 2008; Kruijne & Meeter, 2016; Rayner, 2009). Traditional eye-tracking research has been conducted in laboratory settings, limiting its ecological validity. There is
Supplementary Information The online version contains supplementary material available at https://doi.org/10.3758/s13428-02001504-2. * John Brand [email protected] 1
Department of Epidemiology, Geisel School of Medicine at Dartmouth College, HB 7927, One Medical Center Drive, Lebanon, NH 03765, USA
2
Thayer School of Engineering at Dartmouth College, Hanover, NH, USA
increasing evidence of the importance of examining cognitive processes within their natural context (such as eye movements) in the real world (Ladouce, Donaldson, Dudchenko, & Ietswaart, 2017). Traditional eye-tracking setups do not allow for data collection outside of the laboratory because they are l
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