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Parallel pathways for movement initiation of monkeys

A D Miller, V B Brooks

    Experimental Brain Research
    |January 1, 1982
    PubMed
    Summary
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    The cerebellum, not the motor thalamus, is essential for initiating rapid, learned arm movements in monkeys. Cooling the cerebellum prolonged reaction times, while cooling the thalamus had no effect.

    Area of Science:

    • Neuroscience
    • Motor Control
    • Cerebellar Function

    Background:

    • The precise neural pathways involved in initiating voluntary movements are complex.
    • The cerebellum and its connections through the thalamus to the motor cortex are hypothesized to play key roles.

    Purpose of the Study:

    • To investigate the role of the cerebellum and the motor thalamus in the initiation of rapid, learned arm movements.
    • To determine if the cerebello-thalamo-cortical pathway is essential for movement initiation.

    Main Methods:

    • Three Cebus monkeys performed a simple reaction time task requiring elbow flexion or extension.
    • Cerebellar dentate nucleus and ventral lateral (VL) thalamus were reversibly cooled to assess effects on reaction time.

    Main Results:

    Related Experiment Videos

    • Cooling the ventral lateral thalamus did not alter reaction times.
    • Cooling the cerebellar dentate nucleus significantly prolonged reaction times by approximately 80 ms.

    Conclusions:

    • The cerebellum is crucial for the prompt generation of well-learned intended arm movements.
    • The cerebello-thalamo-cortical pathway, while potentially important, is not essential for the initiation of these movements.