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Related Experiment Videos

Slow eye movements induced by apparent target motion in monkey.

W Waespe, U Schwarz

    Experimental Brain Research
    |January 1, 1987
    PubMed
    Summary

    Monkeys demonstrated slow eye movements opposite to a moving visual stimulus when fixating on a stationary target. These movements suggest perceived target motion, distinct from optokinetic nystagmus suppression.

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Vision Science

    Background:

    • Optokinetic nystagmus (OKN) is an involuntary eye movement reflex.
    • Suppressing OKN involves maintaining fixation on a stationary target despite surrounding motion.

    Purpose of the Study:

    • To investigate slow eye movements during attempted OKN suppression in monkeys.
    • To determine if these movements are related to perceived target motion.

    Main Methods:

    • Monkeys fixated on a stationary target light.
    • An optokinetic drum moved around the monkeys.
    • Eye movements were recorded during fixation and attempted OKN suppression.

    Main Results:

    • Low-amplitude slow eye movements were observed, directed opposite to the drum's motion.
    • These movements differed from the slow phases of incompletely suppressed OKN.
    • The movements were hypothesized to result from perceived target motion.

    Conclusions:

    • Monkeys exhibit distinct slow eye movements when attempting to suppress OKN.
    • These movements may indicate a perceived apparent motion of the fixation target.
    • Findings suggest a link between perceived visual motion and eye movement control during fixation challenges.

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