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Related Experiment Videos

Normal tactile threshold in monkeys with neglect.

R T Watson, E Valenstein, A Day

    Neurology
    |May 1, 1986
    PubMed
    Summary
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    Parietotemporal lesions in monkeys caused neglect by impairing response preparation (intention), not sensory attention. Monkeys failed to use limbs correctly on the normal side after brain injury.

    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Animal Behavior

    Background:

    • Parietotemporal lesions are associated with sensory neglect.
    • The precise nature of neglect, whether sensory or intentional, remains debated.

    Purpose of the Study:

    • To investigate whether parietotemporal lesions cause sensory inattention or defective intention in a learned motor task.
    • To differentiate between sensory processing deficits and response preparation impairments.

    Main Methods:

    • Monkeys were trained to respond to tactile stimuli with a contralateral limb.
    • Parietotemporal lesions were induced, and subsequent behavioral responses were analyzed.
    • Performance was assessed for sensory input, sensory attention, and response intention.

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    Main Results:

    • Following lesions, monkeys exhibited neglect, responding normally to stimuli on the neglected side.
    • Errors occurred when stimulated on the normal side, with impaired use of the contralateral limb.
    • No abnormalities in sensory input or attention were detected on the learned task.

    Conclusions:

    • The observed neglect was attributed to impaired response preparation (intention), not sensory deficits.
    • This suggests a crucial role for the parietotemporal cortex in the intention to act.