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Related Experiment Videos

Orientation and color processing for partially occluded objects

T Watanabe1

  • 1Vision Sciences Laboratory, Arizona State University West, Phoenix 85069-7100.

Vision Research
|March 1, 1995
PubMed
Summary
This summary is machine-generated.

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The McCollough effect, a visual phenomenon, can be triggered by occluded stripe patterns that appear continuous using stereo cues. This suggests early visual processing is involved in perceiving these illusory colors.

Area of Science:

  • Visual Perception
  • Neuroscience
  • Color Vision

Background:

  • The McCollough effect is an orientation-contingent color aftereffect.
  • It is generally believed to occur early in the visual pathway.
  • Previous research focused on fully visible stimuli.

Purpose of the Study:

  • To investigate if the McCollough effect can be elicited by occluded stimuli.
  • To determine the role of perceptual completion in the McCollough effect.
  • To explore the early visual processing mechanisms underlying this phenomenon.

Main Methods:

  • Presenting participants with black and white striped patterns, some fully visible and others partially occluded by white surfaces.
  • Utilizing stereo depth cues to create the perception of continuous stripes under the occluding surfaces.

Related Experiment Videos

  • Measuring the McCollough orientation-contingent color aftereffect.

    • Main Results:

    • The McCollough effect was successfully elicited by both full and occluded stripe patterns.
    • The color aftereffect was concentrated around the visible edges of the occluded stripes.
    • Occluding surfaces remained perceptually uniform white, confirmed by color matching.

    Conclusions:

    • Perceptually completed, occluded edges can elicit the McCollough effect.
    • This finding supports the hypothesis that the McCollough effect involves early visual processing.
    • The study highlights the brain's ability to infer and process information from incomplete visual input.