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Related Experiment Videos

How many faces can be processed during a single eye fixation?

Risto Näsänen1, Helena Ojanpää

  • 1Brainwork Laboratory, Finnish Institute of Occupational Health, Topeliuksenkatu 41 aA, FIN 00250 Helsinki, Finland. risto.nasanen@ttl.fi

Perception
|March 24, 2004
PubMed
Summary
This summary is machine-generated.

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Our study found that people can process 2-4 faces per eye fixation. This perceptual span for facial information was measured using a visual search task with varying array sizes.

Area of Science:

  • Cognitive Psychology
  • Visual Perception

Background:

  • Understanding the perceptual span is crucial for cognitive science.
  • Previous research has explored visual span for text, but facial information processing is less understood.

Purpose of the Study:

  • To estimate the perceptual span for facial information.
  • Determine how many faces can be processed during a single eye fixation.

Main Methods:

  • Visual-search task with facial photographs as targets and distractors.
  • Multiple-alternative staircase method to measure threshold search time (79% accuracy).
  • Eye movements were tracked using a video eye tracker.

Main Results:

  • Threshold search time increased nearly linearly with set size.

Related Experiment Videos

  • Number of fixations increased linearly from 1 to 15 with set size.
  • Estimated perceptual span of 4 faces (2x2 array) and 2.13 faces (8x8 array, half scanned).
  • Mean fixation duration was approximately 200 ms.

    • Conclusions:

    • The perceptual span for facial information is estimated to be 2-4 faces.
    • This processing occurs within a single eye fixation of about 200 ms.