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Related Experiment Video

Updated: Aug 13, 2025

Gaze in Action: Head-mounted Eye Tracking of Children's Dynamic Visual Attention During Naturalistic Behavior
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Offline Calibration for Infant Gaze and Head Tracking across a Wide Horizontal Visual Field.

Chiara Capparini1,2, Michelle P S To2, Clément Dardenne3

  • 1Center for Research in Cognition & Neuroscience (CRCN), Université Libre de Bruxelles, 1050 Brussels, Belgium.

Sensors (Basel, Switzerland)
|January 21, 2023
PubMed
Summary

This study introduces a novel eye-tracking method for infants, enhancing accuracy across a wide field of view. The new offline calibration procedure improves data validity, crucial for developmental research.

Keywords:
calibrationdevelopmental psychologyeye trackinggazeinfancyvisionvisual field

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Developmental Psychology

Background:

  • Traditional eye-tracking systems use remote setups with limited screen widths.
  • Existing methods suffer from calibration issues, data loss from head movements, and reduced data quality over time.

Purpose of the Study:

  • To develop a novel eye-tracking method for wide field of view research.
  • To enhance measurement accuracy through an offline calibration procedure.
  • To adapt existing technology for infant gaze and head movement tracking.

Main Methods:

  • A 4-camera Smart Eye Pro system was modified for infant research.
  • Gaze and head movements were tracked across a 126° horizontal visual field.
  • An online system calibration was combined with a new offline gaze calibration procedure.

Main Results:

  • The system successfully tracked infant head and gaze movements beyond typical screen limitations.
  • Offline calibration improved measurement validity and spatial accuracy, correcting systematic errors.
  • Mean horizontal error was reduced to 1.38°, and mean vertical error to 1.46°.

Conclusions:

  • This novel eye-tracking approach enables accurate measurement of looking behavior in central and peripheral vision.
  • The offline calibration is particularly beneficial for studies involving infants and individuals with difficulties following instructions.
  • This method represents a significant advancement for deriving precise physiological measures from eye movements.