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Creating Objects and Object Categories for Studying Perception and Perceptual Learning
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Published on: November 2, 2012

Perceiving parts and shapes from concave surfaces.

Anthony D Cate1, Marlene Behrmann

  • 1Human Cognitive Neurophysiology Laboratory, Veterans Administration, Northern California Health Care System, 150 Muir Rd., 151-I, P.O. Box 2339, Martinez, CA 94553, USA. acate@ebire.org

Attention, Perception & Psychophysics
|January 5, 2010
PubMed
Summary

Concave shapes are perceived differently than convex ones, challenging visual perception theories. This study reveals concavities may use a distinct process for shape perception, relying on independent features to form gestalts.

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Area of Science:

  • Psychology
  • Cognitive Science
  • Visual Perception

Background:

  • Concave regions present challenges to established theories of visual shape perception.
  • Despite difficulties, humans readily identify concave shapes, suggesting a unique perceptual mechanism.
  • Existing models of part boundary determination conflict with perceived shapes of concavities.

Purpose of the Study:

  • To investigate how observers perceive local image features in simulated 3D concave versus convex regions.
  • To test if different feature perception in concavities leads to similar shape percepts as convexities.
  • To explore the underlying mechanisms of shape perception for concave surfaces.

Main Methods:

  • Utilized shape-from-shading images to create simulated 3D concave and convex regions.
  • Varied image orientation to alter perceived concavity or convexity.
  • Conducted three experiments to analyze observer perception and shape judgments.

Main Results:

  • Concave regions did not benefit from global object-based attention or holistic encoding like convexities.
  • Participants relied on separable spatial dimensions for judging figural shape within concavities.
  • Evidence suggests concavities are processed differently than convexities in visual perception.

Conclusions:

  • Concave shape perception may involve a secondary process distinct from that of convex shapes.
  • This secondary process allows perceptually independent features within concavities to be integrated into gestalt percepts.
  • Understanding concavity perception offers new insights into the flexibility and complexity of the human visual system.