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Related Experiment Videos

Apparent movement induced by afterimages.

R P Power

    Perception
    |January 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    A perceived light source movement in the dark is not due to autokinetic or fluttering hearts phenomena. Instead, ocular drifts and microsaccades cause the afterimage to move, creating the illusion of light source motion.

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    Area of Science:

    • Visual perception
    • Oculomotor function

    Background:

    • Afterimages can alter visual perception.
    • The autokinetic and fluttering hearts phenomena are known visual illusions.

    Purpose of the Study:

    • To investigate the cause of perceived light source movement when viewed through an electronic flash afterimage.
    • To differentiate this phenomenon from known visual illusions.

    Main Methods:

    • Experiment 1: Tested for the autokinetic phenomenon.
    • Experiment 2: Tested for the fluttering hearts phenomenon.
    • Experiment 3: Analyzed ocular movements (drifts, microsaccades, tremors).

    Main Results:

    • The perceived movement was not caused by the autokinetic phenomenon.

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  • The perceived movement was not related to the fluttering hearts phenomenon.
  • Ocular drifts, microsaccades, and tremors were identified as causes for afterimage movement.

    • Conclusions:

    • The afterimage acts as a reference frame.
    • Ocular micro-movements induce the apparent motion of the light source within the afterimage.