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Reversed hemispheric organization in a lefthander.

D C Delis, R T Knight, G Simpson

    Neuropsychologia
    |January 1, 1983
    PubMed
    Summary
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    This study details a left-handed patient with a right brain lesion who exhibited language and spatial skills typically seen in right-handed individuals. This suggests cognitive functions may be inversely represented in the brain for some left-handers.

    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Neurolinguistics

    Background:

    • Brain organization in left-handers is variable, with cognitive functions sometimes mirroring right-handers or being more diffuse.
    • Understanding hemispheric lateralization is crucial for comprehending cognitive processing and neurological disorders.

    Observation:

    • A left-handed patient presented with a focal lesion in the right temporal-parietal region.
    • The patient developed persistent Wernicke's aphasia, a language disorder typically associated with left-hemisphere damage.

    Findings:

    • The patient displayed visual-spatial functioning characteristic of a right-handed individual with left-hemisphere compromise.
    • Performance on other tasks, such as praxis and singing, along with behavioral changes, also aligned with right-hemisphere compromise in a right-handed individual.

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    Implications:

    • This case challenges traditional models of hemispheric lateralization for cognitive functions.
    • It suggests that inverse representation of cognitive functions may occur in the brains of some left-handed individuals.
    • Further research into atypical brain organization in left-handers is warranted to understand the full spectrum of cognitive representation.