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Shapes, surfaces and saccades.

D Melcher1, E Kowler

  • 1Department of Psychology, Rutgers University, Piscataway, NJ 08854, USA.

Vision Research
|September 24, 1999
PubMed
Summary
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Saccades targeting objects land near the center-of-area of the shape, not the average dot location. This indicates that the brain uses a target

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Vision Science

Background:

  • Saccadic eye movements are crucial for visual exploration.
  • Accurate saccadic localization of extended objects requires a unified landing position.
  • The precise visual representation guiding these saccades remains debated.

Purpose of the Study:

  • To investigate whether saccadic eye movements target the center-of-gravity, center-of-area, or symmetric axis of spatially extended visual stimuli.
  • To determine the role of individual dot positions versus overall shape in saccadic localization.

Main Methods:

  • Saccadic eye movements were recorded while participants fixated on dot-defined targets of various shapes (circles, ellipses, blobs).
  • Target configurations included varying dot spacing, adding internal or external dots, and using quasi-random dot clusters.

Related Experiment Videos

  • Participants were instructed to view targets holistically with sufficient latency for accuracy.

    • Main Results:

    • Saccades consistently landed near the center-of-area of the target shape with high precision.
    • Landing positions were not influenced by dot spacing, internal dot distributions, or extraneous dot clusters.
    • For random dot clusters, saccades targeted the center-of-area of the implied surface, not the average dot location.

    Conclusions:

    • Saccadic localization is guided by a representation of the overall target shape, not by the average position of its constituent elements.
    • The brain computes a global shape representation for guiding eye movements, prioritizing contour and area over individual component locations.