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Related Experiment Videos

Ambiguities in colour constancy and shape from shading

T Jakobsson1, S S Bergström, K A Gustafsson

  • 1Department of Applied Psychology, Umeå University, Sweden. torbjorn.jakobsson@apsy.umu.sc

Perception
|January 1, 1997
PubMed
Summary
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The AMBEGUJAS phenomenon reveals ambiguous 3D shapes and colors under simple lighting. This visual illusion demonstrates a striking example of color constancy, where the brain discounts the illuminant.

Area of Science:

  • Visual perception
  • Computational neuroscience
  • Color science

Background:

  • Shape-from-shading is a fundamental problem in computer vision and neuroscience.
  • Perceptual ambiguity in visual stimuli can reveal underlying processing mechanisms.
  • Color constancy is the ability to perceive object colors consistently under varying illumination conditions.

Purpose of the Study:

  • To introduce and describe the novel AMBEGUJAS phenomenon.
  • To investigate the interplay between shape and color perception in ambiguous visual stimuli.
  • To explore the role of color constancy in the AMBEGUJAS phenomenon.

Main Methods:

  • Presentation of a simple visual stimulus with two adjacent, differently colored illuminations on a flat, striped surface.

Related Experiment Videos

  • Descriptive data collection from two initial exploratory experiments.
  • Analysis of spontaneously alternating and mutually exclusive perceived 3D shapes and their associated color impressions.

    • Main Results:

    • The AMBEGUJAS phenomenon presents two distinct, alternating 3D shapes with markedly different perceived colors.
    • One perceived shape appears desaturated, approximating the surface's veridical grey color.
    • The other perceived shape adopts the colors of the two illuminants as surface colors.
    • The desaturated percept serves as a strong example of color constancy, involving discounting the illuminant.

    Conclusions:

    • The AMBEGUJAS phenomenon is a robust visual illusion demonstrating significant ambiguity in both shape and color perception.
    • It provides a unique paradigm for studying the mechanisms of shape-from-shading and color constancy.
    • The results highlight the brain's active role in constructing perceptual reality by interpreting and adjusting for illumination conditions.