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Shape, orientation, and apparent rotational motion.

J E Farrell, R N Shepard

    Journal of Experimental Psychology. Human Perception and Performance
    |April 1, 1981
    PubMed
    Summary
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    Perception of rigid rotation breaks down differently for asymmetric and symmetric shapes. For symmetric polygons, a shorter, nonrigid rotation path can interfere with perceived rigid motion, especially at 180-degree disparities.

    Area of Science:

    • * Cognitive Psychology
    • * Visual Perception
    • * Motion Perception

    Background:

    • * Understanding apparent motion is crucial for explaining visual perception.
    • * Korte's third law traditionally explains linear motion perception.
    • * Extending motion laws to rotational symmetry requires further investigation.

    Purpose of the Study:

    • * Investigate apparent rigid rotation in polygons with varying symmetry.
    • * Determine how orientational disparity affects perceived rigid rotation.
    • * Examine the influence of symmetry on the breakdown of perceived rotation.

    Main Methods:

    • * Polygons with rotational symmetry from random to 180 degrees were used.
    • * Participants adjusted the alternation rate between two orientations.

    Related Experiment Videos

  • * The point of breakdown for perceived rigid rotation was identified.

    • Main Results:

    • * Asymmetric polygons showed a linear increase in minimum stimulus-onset asynchrony with orientational disparity.
    • * Nearly symmetric polygons exhibited a marked increase in critical time near 180-degree disparities.
    • * A shorter, nonrigid rotation path in the opposite direction was available for symmetric polygons.

    Conclusions:

    • * Perceived rigid rotation is influenced by object symmetry and orientational disparity.
    • * Competing mental processes include preserving object rigidity and minimizing transformational path.
    • * The findings extend principles of motion perception to rotational contexts.