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Eye movements during gaze perception.

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Judging direct gaze often requires multiple eye fixations, not just one. This research suggests gaze perception involves a cumulative decision process, with vergence potentially explaining why observers scan both eyes.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Human observers are highly attuned to the gaze of others, especially direct gaze.
  • While gaze perception mechanisms are understood, active perception of direct gaze remains less explored.

Purpose of the Study:

  • To investigate the active perception of direct gaze using eye-tracking.
  • To analyze fixation patterns and scan paths during direct gaze judgments.

Main Methods:

  • Three eye-tracking experiments were conducted.
  • Participants judged direct gaze while their fixations and scan paths were recorded.
  • Fixation durations and locations were analyzed.

Main Results:

  • Direct gaze judgments were rarely based on a single eye fixation.
  • Observers frequently fixated both eyes, sometimes repeatedly.
  • Fixation duration patterns indicated a cumulative decision process.
  • No direct-gaze bias was found; fixating the second eye was more likely with straight gaze.
  • Final fixation location did not follow a systematic pattern.

Conclusions:

  • Active perception of direct gaze involves a cumulative decision process spanning multiple fixations.
  • Factors like vergence may explain the common behavior of scanning both eyes.
  • Understanding these processes is crucial for gaze direction research.