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Perceptual Constancy01:12

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
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The brightness-weight illusion.

Peter Walker1, Brian J Francis, Leanne Walker

  • 1Department of Psychology, Lancaster University, UK. p.walker@lancaster.ac.uk

Experimental Psychology
|April 13, 2010
PubMed
Summary
This summary is machine-generated.

Darker objects appear heavier, but when actually lifted, they feel lighter than brighter objects. This "brightness-weight illusion" demonstrates a perceptual link between an object's color and its perceived weight.

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Area of Science:

  • Psychology
  • Perception
  • Sensory Science

Background:

  • Visual cues like size influence weight perception (size-weight illusion).
  • Darker objects are perceived as heavier than brighter ones visually.
  • The perceptual basis of the brightness-weight association is unclear, potentially linked to language.

Purpose of the Study:

  • To investigate if the brightness-weight association has a perceptual component, similar to the size-weight illusion.
  • To determine if hefting objects reverses the perceived weight difference based on color.

Main Methods:

  • Paired-comparison weight judgments of balls varying in color.
  • Comparing visual-only judgments with judgments involving both vision and touch (hefting).
  • Quantifying the illusion's strength by comparing white and black balls to mid-gray reference balls.

Main Results:

  • Visually, darker objects were judged heavier.
  • When hefted, this perception reversed, with lighter objects feeling heavier (brightness-weight illusion).
  • The illusion indicated a white ball felt ~8g heavier than a black ball of identical weight.

Conclusions:

  • The brightness-weight association has a perceptual component, demonstrated by the illusion.
  • This illusion suggests an ingrained perceptual link between lightness and weight.
  • Environmental factors may contribute to the learned association between surface lightness and perceived weight.