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Related Experiment Videos

A visual deficit after superior colliculus lesions in monkeys

D A MacKinnon, C G Gross, D B Bender

    Acta Neurobiologiae Experimentalis
    |January 1, 1976
    PubMed
    Summary

    Lesions to the superior colliculus impaired rhesus monkeys' ability to reach for targets signaled by brief visual stimuli. However, performance remained normal with longer or continuous visual cues.

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    Area of Science:

    • Neuroscience
    • Primate behavior
    • Visual-motor control

    Background:

    • The superior colliculus is crucial for visual orientation and localization in mammals.
    • Understanding its precise role in rhesus monkeys requires targeted investigation.

    Purpose of the Study:

    • To investigate the superior colliculus's role in visual-guided reaching in rhesus monkeys.
    • To determine the impact of superior colliculus lesions on visually guided reaching accuracy with varying stimulus durations.

    Main Methods:

    • Rhesus monkeys were trained on a visual-guided reaching task with stimuli presented at six locations.
    • Tectal lesions were performed, and monkeys were re-tested with varying stimulus durations (5s vs. 1s) and stimulus-response configurations.

    Main Results:

    • Monkeys with tectal lesions performed normally on the task with a 5s stimulus duration.
    • A significant deficit in reaching accuracy was observed when the visual stimulus duration was reduced to 1s.
    • Performance remained normal when the stimulus was continuously present throughout the trial, even with increased stimulus-response separation.

    Conclusions:

    • The superior colliculus is critical for accurate reaching guided by transient visual stimuli.
    • The deficit suggests a role for the superior colliculus in processing brief visual cues for precise motor control.
    • Findings implicate the superior colliculus in the control of eye movements underlying visually guided behaviors.

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