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Related Experiment Videos

Rigidity in cinema seen from the front row, side aisle.

J E Cutting1

  • 1Department of Psychology, Cornell University, Ithaca, New York 14853-7601.

Journal of Experimental Psychology. Human Perception and Performance
|August 1, 1987
PubMed
Summary

Perception of rotating objects on slanted screens is possible without cognitive shape rectification. The human visual system tolerates projection distortions, perceiving rigidity based on local projective geometry principles.

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Area of Science:

  • Visual perception
  • Cognitive psychology
  • Computer vision

Background:

  • Objects viewed at an angle on screens appear distorted.
  • Linear perspective suggests moving objects on slanted screens shouldn't appear rigid.
  • Previous theories proposed cognitive processes for shape rectification.

Purpose of the Study:

  • To investigate the perception of rigidity for rotating objects on slanted cinema screens.
  • To challenge existing cognitive rectification theories.
  • To propose an alternative explanation for shape constancy in slanted projections.

Main Methods:

  • Three experiments were conducted using rotating, rectangular objects in slanted cinema.
  • Stimuli were designed to test perception under varying projection conditions.

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  • Data analysis focused on whether perceived rigidity was maintained.

    • Main Results:

    • Existing cognitive rectification theories were found to be unnecessary and insufficient.
    • Perceivers could determine object rigidity on slanted screens, particularly for parallel projections.
    • The human visual system makes local object measurements using projective geometry.

    Conclusions:

    • Shape constancy in slanted projections does not solely rely on recovering screen slant.
    • The visual system tolerates minor projection distortions.
    • Perceived non-rigidity occurs when local projective principles (Perkins's laws) are violated.