How Well Can Humans Refixate a Target?
Author Information
Author(s): Hooge Ignace T., Hessels Roy S., Niehorster Diederick C., Andersson Richard, Skrok Marta K., Konklewski Robert, Stremplewski Patrycjusz, Nowakowski Maciej, Tamborski Szymon, Szkulmowska Anna, Szkulmowski Maciej, Nyström Marcus
Primary Institution: Utrecht University, Utrecht, The Netherlands
Hypothesis
The pupil-size artefact and inconsistent fixation may cause inaccuracies during eye tracker calibration and validation.
Conclusion
The pupil plays a significant role in the inaccuracy of pupil-CR eye trackers, while humans can accurately refixate visual targets.
Supporting Evidence
- The pupil-size artefact significantly affects gaze accuracy, introducing inaccuracies during calibration and validation.
- Corrections based on pupil size relations can reduce inaccuracies in eye tracking.
- Humans can accurately refixate visual targets, as shown by the small Bivariate Contour Ellipse Areas in the retinal eye tracking experiment.
Takeaway
This study shows that changes in pupil size can make eye tracking less accurate, but people are really good at looking at the same spot again.
Methodology
Two experiments were conducted: one using a pupil-CR eye tracker and another using a retinal eye tracker to assess refixation accuracy.
Potential Biases
Potential bias due to the small sample size and the specific experience level of participants.
Limitations
The study involved only experienced participants, which may not represent the general population.
Participant Demographics
All participants were experienced in eye tracking, with at least 18 years of experience.
Digital Object Identifier (DOI)
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