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Related Experiment Videos

The McCollough effect in rhesus monkey.

W M Maguire, G E Meyer, J S Baizer

    Investigative Ophthalmology & Visual Science
    |March 1, 1980
    PubMed
    Summary
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    Rhesus monkeys and humans experience the McCollough effect, a visual phenomenon where prolonged exposure to colored stripes alters color perception. This study confirms this effect in both species, suggesting shared visual processing mechanisms.

    Area of Science:

    • Neuroscience
    • Visual Perception
    • Comparative Psychology

    Background:

    • The McCollough effect is a visual phenomenon where color perception is altered after adaptation to specific color-orientation stimuli.
    • This effect is theorized to involve specialized cells in the visual cortex tuned for both color and orientation.
    • Such cells have been identified in the visual cortex of rhesus monkeys.

    Purpose of the Study:

    • To investigate whether rhesus monkeys exhibit the McCollough effect, similar to humans.
    • To explore potential shared neural mechanisms of visual perception between humans and non-human primates.

    Main Methods:

    • Two humans and two rhesus monkeys were adapted to alternating red vertical and green horizontal gratings.
    • Subjects fixated on a slowly moving spot across these gratings.

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  • Following adaptation, subjects responded to a test grating that shifted between red and green, indicating perception of white.

    • Main Results:

    • All four subjects (two humans, two rhesus monkeys) demonstrated orientation-specific changes in their responses.
    • These changes were consistent with the predicted perceptual alterations of the McCollough effect.
    • The results suggest that both humans and rhesus monkeys experience this visual phenomenon.

    Conclusions:

    • Rhesus monkeys, like humans, experience the McCollough effect.
    • This finding supports the hypothesis of shared long-term adaptation mechanisms for color and orientation in the visual cortex of primates.
    • The study provides evidence for conserved visual processing pathways across species.