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Spatial disorientation in the monkey.

G Ratcliff, R M Ridley, G Ettlinger

    Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
    |March 1, 1977
    PubMed
    Summary
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    Monkeys with brain damage showed misdirected hand movements during tactile tasks. This suggests spatial disorientation contributes to their reaching inaccuracies.

    Area of Science:

    • Neuroscience
    • Primate Behavior
    • Sensory Processing

    Background:

    • Tactile discrimination is crucial for object interaction.
    • The parieto-prestriate cortex plays a role in spatial processing and sensorimotor control.

    Purpose of the Study:

    • To investigate the impact of parieto-prestriate cortex lesions on hand movements during tactile discrimination in monkeys.
    • To determine if spatial disorientation contributes to motor deficits after cortical damage.

    Main Methods:

    • Monkeys with bilateral parieto-prestriate cortex removals were tested.
    • Tactile discrimination tasks were performed in a dark environment.
    • The incidence of misdirected hand movements was systematically recorded.

    Main Results:

    Related Experiment Videos

    • Lesioned monkeys exhibited a notable incidence of misdirected hand movements.
    • These misdirected movements occurred alongside inaccuracies in reaching.
    • The findings indicate a deficit in spatial processing.

    Conclusions:

    • Bilateral removal of the parieto-prestriate cortex leads to spatial disorientation in monkeys.
    • This disorientation contributes to motor control deficits, specifically in reaching and tactile tasks.
    • The study highlights the role of this brain region in integrating sensory information for accurate movement.