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Related Experiment Videos

The copycat solution to the shadow correspondence problem.

Roberto Casati1

  • 1Institut Jean Nicod, CNRS-EHESS-ENS, Paris, France. casati@ehess.fr

Perception
|June 13, 2008
PubMed
Summary
This summary is machine-generated.

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Artistic shadows can be inaccurate and still convey spatial information. Painters sometimes use a "copycat" strategy, replicating the object

Area of Science:

  • * Visual Perception
  • * Art History
  • * Cognitive Science

Background:

  • * Cast shadows in art serve perceptual functions like 3-D structure and object localization.
  • * The visual system tolerates significant geometric inaccuracy in depicted shadows.
  • * The limits of tolerable shadow inaccuracy remain largely unexplored.

Purpose of the Study:

  • * To investigate the extent of tolerable inaccuracy in depicted shadows.
  • * To propose that shadow inaccuracy can be preferable to accuracy for object localization.
  • * To explore the effectiveness of the
  • Main_Methods
  • * Analysis of a historical corpus of artworks depicting shadows.
  • * Examination of the
  • copycat strategy

Related Experiment Videos

  • where shadow profiles mimic the caster's visible outline.
  • * Comparison of the perceptual effectiveness of geometrically accurate versus inaccurate shadows.

    • Main Methods:

    • * Analysis of a historical corpus of artworks depicting shadows.
    • * Examination of the
    • copycat strategy
    • where shadow profiles mimic the caster's visible outline.
    • * Comparison of the perceptual effectiveness of geometrically accurate versus inaccurate shadows.

    Main Results:

    • * Painters have employed a
    • copycat strategy
    • , creating geometrically impossible shadows that replicate the caster's profile.
    • * This strategy effectively solves the correspondence problem, linking shadows to their casters.
    • * The copycat strategy can be more effective than geometrically accurate depictions and complements other localization cues.

    Conclusions:

    • * Shadow inaccuracy is not only acceptable but can be perceptually advantageous for object localization.
    • * The brain's spatial perception mechanisms are not based on simplified physical models.
    • * The copycat effect in art offers insights into the brain's computational strategies for space perception.