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On the Morinaga Misalignment Illusion.

R H Day, S Bellamy, A Norman

    Journal of Experimental Psychology. Human Perception and Performance
    |February 1, 1983
    PubMed
    Summary
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    The Morinaga illusion, a visual perception phenomenon, causes apparent misalignment of angles. This study explores its characteristics and finds perceptual assimilation to be a plausible explanation.

    Area of Science:

    • Visual Perception
    • Psychophysics
    • Cognitive Science

    Background:

    • The Morinaga illusion involves the apparent misalignment of oppositely facing angles.
    • It is also known as the Morinaga paradox due to its counterintuitive direction compared to the Müller-Lyer illusion.

    Purpose of the Study:

    • To investigate the factors influencing the Morinaga illusion.
    • To compare the Morinaga illusion with other geometric illusions.
    • To explore potential explanations for the observed perceptual effects.

    Main Methods:

    • Six experiments were conducted to systematically vary stimulus parameters.
    • Stimuli included aligned angles, lines, squares, and circles.
    • Variations involved orientation (oblique, vertical, horizontal), element replacement (lines, dots), and element spacing.

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    Main Results:

    • The illusion was strongest with oblique alignments (oblique effect).
    • Replacing outer angles with dots diminished the illusion, while replacing the central apex with a dot had less effect.
    • The illusion extended to parallel lines and square edges but not to circle tangents.
    • Small, widely spaced elements amplified the effect.

    Conclusions:

    • Perceptual assimilation is a more plausible explanation for the Morinaga illusion than perceptual normalization to a line.
    • Both assimilation and normalization may contribute to the illusion's manifestation.