Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

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

Hooge, Ignace T C LU ; Hessels, Roy S ; Niehorster, Diederick C LU orcid ; Andersson, Richard LU ; Skrok, Marta K ; Konklewski, Robert ; Stremplewski, Patrycjusz ; Nowakowski, Maciej ; Tamborski, Szymon and Szkulmowska, Anna , et al. (2024) In Behavior Research Methods 57. p.23-23
Abstract

Irrespective of the precision, the inaccuracy of a pupil-based eye tracker is about 0.5 ∘ . 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 ∘ inaccuracies during calibration and validation. Corrections based on the relation between pupil size and apparent gaze shift... (More)

Irrespective of the precision, the inaccuracy of a pupil-based eye tracker is about 0.5 ∘ . 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 ∘ 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.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and , et al. (More)
; ; ; ; ; ; ; ; ; ; and (Less)
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Humans, Eye-Tracking Technology, Calibration, Pupil/physiology, Male, Eye Movements/physiology, Female, Adult, Fixation, Ocular/physiology, Young Adult, Pupil-CR eye tracker, Accuracy, Pupil size artefact, Retinal eye tracker
in
Behavior Research Methods
volume
57
pages
23 - 23
publisher
Springer
external identifiers
  • pmid:39702537
ISSN
1554-3528
DOI
10.3758/s13428-024-02564-4
language
English
LU publication?
yes
additional info
© 2024. The Author(s).
id
100bf2e8-6f8f-4485-978d-213c2bc5214a
date added to LUP
2024-12-22 13:15:00
date last changed
2025-01-13 11:47:16
@article{100bf2e8-6f8f-4485-978d-213c2bc5214a,
  abstract     = {{<p>Irrespective of the precision, the inaccuracy of a pupil-based eye tracker is about 0.5     ∘  . 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     ∘  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. </p>}},
  author       = {{Hooge, Ignace T C and Hessels, Roy S and Niehorster, Diederick C and Andersson, Richard and Skrok, Marta K and Konklewski, Robert and Stremplewski, Patrycjusz and Nowakowski, Maciej and Tamborski, Szymon and Szkulmowska, Anna and Szkulmowski, Maciej and Nyström, Marcus}},
  issn         = {{1554-3528}},
  keywords     = {{Humans; Eye-Tracking Technology; Calibration; Pupil/physiology; Male; Eye Movements/physiology; Female; Adult; Fixation, Ocular/physiology; Young Adult; Pupil-CR eye tracker; Accuracy; Pupil size artefact; Retinal eye tracker}},
  language     = {{eng}},
  month        = {{12}},
  pages        = {{23--23}},
  publisher    = {{Springer}},
  series       = {{Behavior Research Methods}},
  title        = {{Eye tracker calibration : How well can humans refixate a target?}},
  url          = {{http://dx.doi.org/10.3758/s13428-024-02564-4}},
  doi          = {{10.3758/s13428-024-02564-4}},
  volume       = {{57}},
  year         = {{2024}},
}