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Comparing eye trackers by correlating their eye-metric data.

Johannes Titz1, Agnes Scholz2, Peter Sedlmeier3

  • 1Department of Psychology, Research Methods and Evaluation in Psychology, Chemnitz University of Technology, Wilhelm-Raabestr. 43, 09111, Chemnitz, Germany. johannes.titz@gmail.com.

Behavior Research Methods
|September 8, 2017
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Summary

Low-cost eye trackers are now viable for research. A study found that the EyeTribe device accurately tracked pupil size and gaze, correlating highly with established trackers, proving their reliability for scientific applications.

Keywords:
Eye trackingLow costPupil size

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Area of Science:

  • Cognitive Psychology
  • Human-Computer Interaction
  • Neuroscience

Background:

  • High cost of traditional eye trackers has limited their widespread adoption in research and daily life.
  • Recent introduction of affordable eye-tracking devices presents an opportunity to expand their use.
  • Validation of low-cost trackers' accuracy is crucial for their integration into scientific practice.

Purpose of the Study:

  • To evaluate the accuracy and reliability of a new low-cost eye tracker (EyeTribe) compared to an established device (SensoMotoric Instruments).
  • To propose a method for comparing eye trackers using construct correlation, adapted from psychological diagnostics.
  • To assess the impact of calibration quality on eye-tracking metrics.

Main Methods:

  • A laboratory study simultaneously recorded data from a low-cost EyeTribe and a high-end SensoMotoric Instruments eye tracker.
  • Participants (n=26) engaged in a memory task involving viewing images or words and making cognitive judgments.
  • Eye-tracking metrics (pupil size, point of regard) were collected and correlated over time using a mixed-effects model.

Main Results:

  • Pupil size and point of regard data from both eye trackers were highly correlated.
  • Calibration quality significantly influenced individual differences in gaze tracking, but not pupil size.
  • The findings indicate that the low-cost tracker provides comparable data quality to the established device.

Conclusions:

  • Low-cost eye trackers, such as the EyeTribe, can serve as reliable and accurate alternatives to expensive established devices for many research applications.
  • The proposed correlation method effectively validates eye-tracking technology.
  • The accessibility of eye-tracking technology is likely to increase significantly due to the availability of affordable, high-quality devices.