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Related Experiment Videos

A tapping test in apraxia.

K M Heilman

    Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
    |September 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Motor apraxia, a condition affecting the left hemisphere, impairs left-hand imitation. This study found apraxic patients exhibit motor deficits in a finger-tapping task, supporting Liepmann's theory of motor memory storage.

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    Area of Science:

    • Neuroscience
    • Neurology
    • Cognitive Science

    Background:

    • Motor apraxia presents an enigma, particularly when left hemisphere lesions impair left-hand imitation despite intact motor function.
    • Liepmann's hypothesis posits that motor memories are stored in the left hemisphere, and apraxia results from their destruction or disconnection.

    Purpose of the Study:

    • To investigate potential motor deficits in the non-paretic hand of patients with motor apraxia.
    • To test Liepmann's hypothesis regarding the localization of motor engrams in the left hemisphere.

    Main Methods:

    • Twenty patients diagnosed with motor apraxia underwent a rapid finger-tapping test.
    • Performance of the apraxic group was compared to the left-hand performance of a control group with aphasia and right hemiparesis but without apraxia.

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    Main Results:

    • Apraxic patients demonstrated significantly slower performance on the rapid finger-tapping test compared to the control group.
    • This finding indicates a motor impairment in the non-paretic hand of individuals with motor apraxia.

    Conclusions:

    • The results provide empirical support for Liepmann's hypothesis concerning the role of the left hemisphere in storing motor memories.
    • Motor apraxia may involve not only imitation deficits but also a more generalized motor impairment affecting the non-paretic limb.