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Related Experiment Videos

Visually induced adaptive changes in primate saccadic oculomotor control signals.

L M Optican, F A Miles

    Journal of Neurophysiology
    |October 1, 1985
    PubMed
    Summary

    The brain adapts to suppress eye drift after saccades by adjusting neural signals, a process influenced by visual feedback and taking days to adapt but quicker to recover from.

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    Progress in brain research·2008

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Systems Biology

    Background:

    • Saccades are rapid eye movements for visual fixation.
    • Postsaccadic ocular drift can occur due to motor deficits.
    • The brain can suppress postsaccadic drift via visual and proprioceptive feedback.

    Purpose of the Study:

    • Characterize the adaptive mechanism for suppressing postsaccadic drift.
    • Investigate the role of retinal slip in adaptation.
    • Examine the time course of adaptation, recovery, and decay.

    Main Methods:

    • Studied seven rhesus monkeys' responses to induced postsaccadic retinal slip.
    • Used horizontal exponential movements of a full-field stimulus.
    • Analyzed eye movements in light and dark conditions.

    Main Results:

    • Monkeys developed compensatory postsaccadic drift after saccade-related retinal image slip.
    • Retinal slip alone induced adaptation, independent for leftward/rightward saccades.
    • Adaptation took days, recovery in light was faster, and decay in darkness was slow.

    Conclusions:

    • The brain's suppression of postsaccadic drift is an adaptive process.
    • A simple pulse-step model of saccadic innervation is insufficient; a pulse-slide-step model is more realistic.
    • The adaptive mechanism involves adjustments to the slide and step components of saccadic innervation.

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