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Dyslexia and brain morphology.

G W Hynd, M Semrud-Clikeman

    Psychological Bulletin
    |November 1, 1989
    PubMed
    Summary
    This summary is machine-generated.

    Neuroimaging studies reveal brain morphology differences in dyslexia, including increased symmetry in language areas and focal dysplasias. Further research is needed to confirm these findings and their uniqueness to dyslexia.

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    Area of Science:

    • Neuroscience
    • Developmental Psychology
    • Cognitive Science

    Background:

    • The neurological basis of dyslexia remains incompletely understood.
    • Direct evidence linking brain morphology to dyslexia symptoms is limited.

    Purpose of the Study:

    • To review evidence on brain morphology deviations in dyslexia.
    • To explore the relationship between brain structure and behavioral correlates of dyslexia.

    Main Methods:

    • Review of computed tomography (CT)/magnetic resonance imaging (MRI) studies.
    • Review of postmortem and cytoarchitectonic studies.

    Main Results:

    • CT/MRI studies suggest increased symmetry in the planum temporale and parietooccipital cortex in dyslexics.

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  • Postmortem studies indicate symmetry of the plana, thalamic involvement, and focal dysplasias in specific brain regions.
  • Methodological limitations exist in current research, including diagnostic criteria and assessment of neurolinguistic deficits.

    • Conclusions:

    • Evidence suggests potential brain morphology differences associated with dyslexia.
    • Further rigorous research is required to establish a definitive link and uniqueness of these findings to dyslexia.