Abstract Irrespective of the precision, the inaccuracy of a pupil-based eye tracker is about 0.5 $$^\circ $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mrow/> <mml:mrow/> <mml:mo>∘</mml:mo> </mml:mmultiscripts> </mml:math> . This paper delves into two factors that potentially increase the inaccuracy of the gaze signal, namely, 1) Pupil-size changes and the pupil-size artefact (PSA) and 2) the putative inability of experienced individuals to precisely refixate a visual target. Experiment 1 utilizes a traditional pupil-CR eye tracker, while Experiment 2 employs a retinal eye tracker, the FreezeEye tracker, eliminating the pupil-based estimation. Results reveal that the PSA significantly affects gaze accuracy, introducing up to 0.5 $$^\circ $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mrow/> <mml:mrow/> <mml:mo>∘</mml:mo> </mml:mmultiscripts> </mml:math> inaccuracies during calibration and validation. Corrections based on the relation between pupil size and apparent gaze shift substantially reduce inaccuracies, underscoring the PSA’s influence on eye-tracking quality. Conversely, Experiment 2 demonstrates humans’ precise refixation abilities, suggesting that the accuracy of the gaze signal is not limited by human refixation inconsistencies.

Ignace T. C. Hooge

Roy S. Hessels

Diederick C. Niehorster

Richard Andersson

Marta K. Skrok

Robert Konklewski

Patrycjusz Stremplewski

Maciej Nowakowski

Szymon Tamborski

Anna Szkulmowska

Maciej Szkulmowski

Marcus Nyström

Behavior Research Methods

行为研究方法发表与实验心理学研究的方法、技术和仪器有关的文章。该杂志特别关注计算机技术在心理学研究中的应用。年度特刊专门针对这一领域。

The journal "Behavior Research Methods" focuses on publishing articles related to methods, techniques, and instruments in experimental psychology research. It particularly emphasizes the application of computer technology in psychological research and publishes annual special issues dedicated to this field.

《Behavior Research Methods》期刊专注于发表与实验心理学研究相关的方法、技术和仪器的文章。该杂志特别关注计算机技术在心理学研究中的应用，并每年出版专门针对这一领域的特刊。

Category	Quartile
心理学	2
心理学, 心理学数学	1
心理学, 心理学实验	2

Eye tracker calibration: How well can humans refixate a target?

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Journal Info

Category	Quartile
PSYCHOLOGY, MATHEMATICAL	1