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Clinical aspects of premotor function.

H J Freund

    Behavioural Brain Research
    |November 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Frontal lobe lesions, not affecting primary motor cortex, cause permanent limb weakness and incoordination. Sensory-motor integration, crucial for movement control, likely occurs in posterior brain regions, not the frontal lobe.

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    Area of Science:

    • Neuroscience
    • Neurology
    • Cognitive Science

    Background:

    • Frontal lobe lesions, particularly impacting the premotor cortex, can lead to persistent motor deficits.
    • Understanding the specific roles of different brain regions in motor control and sensory-motor integration is crucial for diagnosing and treating neurological disorders.

    Purpose of the Study:

    • To investigate the functional deficits resulting from frontal lobe lesions, specifically those involving the premotor cortex.
    • To differentiate the roles of frontal and parieto-occipital lobes in motor control, sensory guidance, and visuomotor integration.

    Main Methods:

    • Clinical examination of patients with frontal lobe lesions identified via CT scans.
    • Observation of motor deficits including limb weakness, incoordination (limb-kinetic apraxia), and visually guided reaching abnormalities.

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  • Comparison of deficits observed after frontal lesions with those typically seen after parieto-occipital lesions.

    • Main Results:

    • Frontal lesions (excluding primary motor cortex) resulted in permanent contralateral shoulder/hip weakness and limb-kinetic apraxia.
    • No deficits in sensory guidance of movement were observed with frontal lesions.
    • Visuomotor ataxia and tactile apraxia were prominent after parieto-occipital lesions, but absent after frontal lesions.

    Conclusions:

    • Sensory-motor integration and transformation processes are likely localized to the posterior brain regions (parieto-occipital lobes).
    • Frontal lobe lesions, specifically involving the premotor cortex, do not appear to disrupt these higher-level sensory-motor functions, suggesting a distinct functional localization.