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Related Experiment Videos

Spatial induction of illusory motion

W C Gogel, B W Griffin

    Perception
    |January 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Induced motion can occur in 3D space, not just flat planes. Experiments show that motion in depth and eye movements significantly influence perceived motion, challenging existing theories.

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    Area of Science:

    • Visual perception
    • Psychophysics
    • Neuroscience

    Background:

    • Induced motion is a visual phenomenon where a stationary or moving object appears to move due to the motion of surrounding objects.
    • Existing theories primarily focus on induced motion within a frontoparallel plane.

    Purpose of the Study:

    • To investigate induced motion beyond the frontoparallel plane, specifically in three-dimensional space.
    • To examine the role of motion in depth and eye movements in induced motion.
    • To test alternative explanations for observed phenomena.

    Main Methods:

    • Observers perceived the motion path of a vertically moving test point with added induced motion.
    • Experiments involved motions in a frontoparallel plane and in stereoscopic depth.

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  • Eye movements were recorded during fixation on the test or inducing points.

    • Main Results:

    • Discrete and continuous motion induced significant perceived motion in the frontoparallel plane.
    • A large amount of apparent motion in depth was observed for the test point when inducing points moved in depth.
    • Induced motion occurred regardless of whether the observer fixated the test or inducing points.

    Conclusions:

    • Induced motion is not restricted to frontoparallel planes and can occur in depth.
    • The findings necessitate revisions to current theories of induced motion to account for 3D motion and eye movements.