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Related Experiment Videos

Two forms of ideomotor apraxia

K M Heilman, L J Rothi, E Valenstein

    Neurology
    |April 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Researchers identified two types of ideomotor apraxia. Posterior/fluent patients showed deficits in distinguishing movements, unlike those with anterior lesions or nonfluent aphasia.

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    Praxis performance with left versus right hemisphere lesions.

    NeuroRehabilitation·2014

    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Neurology

    Background:

    • Ideomotor apraxia is a disorder of skilled, purposeful movement.
    • Distinguishing between destruction and disconnection of parietal areas is crucial for understanding apraxia subtypes.

    Purpose of the Study:

    • To differentiate between two potential causes of ideomotor apraxia: destruction versus disconnection of parietal visuokinesthetic engrams.
    • To investigate the distinct clinical manifestations of these two proposed apraxic subtypes.

    Main Methods:

    • Administered movement and act-discrimination tasks to patients with anterior lesions/nonfluent aphasia and posterior lesions/fluent aphasia.
    • Compared performance on these tasks between apraxic and nonapraxic patient groups, as well as between lesion locations.

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    Main Results:

    • Patients with posterior lesions and fluent aphasia performed significantly worse on both movement and act-discrimination tasks.
    • This poorer performance suggests a deficit in distinguishing between well- and poorly-performed movements, consistent with parietal area destruction.

    Conclusions:

    • The findings support the existence of at least two distinct types of ideomotor apraxia.
    • Results indicate that posterior/fluent patients exhibit a form of apraxia linked to the destruction of visuokinesthetic motor engrams.