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A methodological framework for capturing relative eyetracking coordinate data to determine gaze patterns and

Joanna C Scurr1, Jenny Page, Heather Lunt

  • 1Department of Sport and Exercise Science, Spinnaker Building, University of Portsmouth, Cambridge Road, Portsmouth, UK, Joanna.scurr@port.ac.uk.

Behavior Research Methods
|January 31, 2014
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Summary

Researchers developed a new method to track simultaneous gaze and fixations in multiple people viewing dynamic scenes, even with head movements. This framework enhances ecological validity for eye-tracking studies.

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Area of Science:

  • Oculomotor research
  • Human-computer interaction
  • Visual perception

Background:

  • Analyzing simultaneous gaze behaviors and recurrent fixations during dynamic scene viewing with head movement is challenging.
  • Existing methodologies often lack the ability to account for head movement and nonstandard observer positioning.

Purpose of the Study:

  • To develop a methodological framework for assessing simultaneous gaze behaviors and recurrent fixations.
  • To account for head movement and nonstandard observer positioning in eye-tracking analysis.
  • To improve the ecological validity of gaze analysis in dynamic environments.

Main Methods:

  • Gaze coordinates were recorded using eye-tracking equipment during head movements (six degrees of freedom).
  • Image markers and SIMI Motion Analysis software were used to calculate gaze coordinates relative to head movement, correcting for perspective error.
  • The methodology was validated using participant dyads and compared against manual calculations for fixation frequency, duration, and recurrent fixations.

Main Results:

  • The developed methodology demonstrated acceptable error (<3.5%CV) between measured and calculated gaze coordinates.
  • Fixation frequencies and durations within areas of interest compared well to manual calculations.
  • Analysis of recurrent fixations in participant dyads also showed good agreement with manual analysis.

Conclusions:

  • A valid and reliable methodological framework for analyzing simultaneous gaze behaviors and recurrent fixations has been established.
  • The framework effectively accounts for head movement and nonstandard observer positioning, enhancing ecological validity.
  • This approach reduces environmental constraints and facilitates more accurate oculomotor variable analysis in group viewing studies.