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Related Experiment Videos

Spatial contingency and the McCollough effect.

S Siegel1, L G Allan, L Roberts

  • 1McMaster University, Hamilton, Ontario, Canada.

Perception & Psychophysics
|October 1, 1990
PubMed
Summary
This summary is machine-generated.

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Investigating the McCollough effect, this study found that reducing spatial contingency, contrary to predictions, actually strengthens the color aftereffect. This challenges existing conditioning theories of visual perception.

Area of Science:

  • Visual perception
  • Cognitive psychology
  • Neuroscience

Background:

  • The McCollough effect (ME) is an orientation-contingent color aftereffect.
  • Conditioning analysis suggests ME strength depends on contingency between orientation and chromatic stimuli.
  • Previous research found temporal contingency reduction does not affect ME strength.

Purpose of the Study:

  • To test the hypothesis that reducing spatial contingency attenuates the McCollough effect.
  • To investigate the role of spatial contingency in visual aftereffects.

Main Methods:

  • Experiments manipulated spatial contingency by extending color stimuli beyond grid confines.
  • Participants viewed chromatic grids and subsequently judged the color of achromatic test gratings.

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Main Results:

  • Decreasing spatial contingency did not decrease the McCollough effect.
  • Extending color beyond grid confines unexpectedly increased the aftereffect's strength.

Conclusions:

  • Spatial contingency reduction does not attenuate the ME as predicted by conditioning models.
  • The results challenge current conditioning-based explanations of the McCollough effect.
  • Visual aftereffects may be influenced by spatial relationships in ways not fully captured by simple contingency reduction.