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Related Experiment Videos

Response time in monkeys with unilateral neglect.

E Valenstein, R T Watson, T Van den Abell

    Archives of Neurology
    |May 1, 1987
    PubMed
    Summary
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    Monkeys with unilateral neglect showed increased response times when performing a task, suggesting a motor deficit in intention to act rather than sensory neglect.

    Area of Science:

    • Neuroscience
    • Primate behavior
    • Motor control

    Background:

    • Unilateral neglect is a neurological disorder characterized by a failure to respond to stimuli on one side of space.
    • The underlying mechanisms of neglect, particularly the distinction between sensory and motor deficits, remain incompletely understood.

    Purpose of the Study:

    • To investigate the impact of unilateral neglect on motor task performance in non-human primates.
    • To differentiate between sensory neglect and motor neglect in the context of response time.

    Main Methods:

    • Four monkeys were trained on a task requiring them to open a door using either hand in response to a tactile stimulus.
    • Unilateral frontal arcuate lesions were induced to create neglect, and response times were measured.
    • Control lesions of the anterior superior temporal cortex were also performed for comparison.

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    Main Results:

    • Monkeys with unilateral neglect exhibited increased response times, particularly when using the hand contralateral to the lesion.
    • Response times also increased when using the ipsilateral hand, indicating a broader motor planning deficit.
    • Stimulus side did not affect response time, and control lesions had minimal impact.

    Conclusions:

    • Unilateral neglect is associated with increased motor response times.
    • The findings support the hypothesis that motor neglect, a deficit in the intention to act, contributes significantly to the observed response time delays.
    • This suggests that neglect involves more than just sensory processing impairments.