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Diagonal Method to Measure Synergy Among Any Number of Drugs
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Published on: June 21, 2018

Multiplicative and additive Adelson's snake illusions.

Karin Petrini1

  • 1Department of Psychology, University of Glasgow, 58 Hillhead Street, Glasgow G12 8QB, Scotland, UK. karin@psy.gla.ac.uk

Perception
|February 5, 2009
PubMed
Summary
This summary is machine-generated.

The visual system uses both additive and multiplicative components of atmospheric conditions as heuristics to perceive object lightness. Both components similarly influence the magnitude of the snake lightness illusion.

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Area of Science:

  • Visual Perception
  • Computational Neuroscience
  • Color Science

Background:

  • The Adelson snake lightness illusion demonstrates how perceived lightness is influenced by surrounding context.
  • Previous research has focused on specific aspects of the illusion, but a quantitative comparison of different atmospheric components is lacking.

Purpose of the Study:

  • To quantitatively investigate two versions of the Adelson snake lightness illusion.
  • To determine the relative contribution of additive and multiplicative atmospheric components to the lightness illusion.

Main Methods:

  • Investigated an additive version by manipulating the additive component of the atmosphere transfer function (ATF).
  • Examined a multiplicative version by altering the multiplicative component of the ATF.
  • Four observers matched target lightness using Munsell samples under varying ATF conditions.

Main Results:

  • Increasing either the additive or multiplicative component of the ATF resulted in a comparable increase in the illusion's magnitude.
  • Both components significantly influenced the perceived lightness of the snake patterns.

Conclusions:

  • The human visual system utilizes both additive and multiplicative atmospheric cues as heuristics for anchoring luminance.
  • These heuristics are employed in converting object luminance into perceived lightness, especially when other contextual information is absent.