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Related Experiment Videos

[Handedness, cerebral dysfunction and dyslexia].

A Céspedes, J Berneosolo, L Bravo

    Revista Chilena De Pediatria
    |January 1, 1989
    PubMed
    Summary

    Dyslexic children show a higher frequency of left-handedness and neurological soft signs. This supports theories linking dyslexia and left-handedness to atypical brain development affecting language and motor skills.

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    Area of Science:

    • Neuroscience
    • Developmental Psychology
    • Genetics

    Context:

    • Dyslexia is a common developmental disorder affecting reading ability.
    • Neurological soft signs are subtle indicators of central nervous system dysfunction.
    • Handedness, particularly left-handedness, has been anecdotally linked to developmental disorders.

    Purpose:

    • To investigate the relationship between handedness and neurological soft signs in dyslexic children.
    • To compare the frequency of left-handedness and soft signs in dyslexic children versus good readers.
    • To evaluate the concordance of findings with existing theories on the neurodevelopmental origins of dyslexia and left-handedness.

    Summary:

    • A study of 56 dyslexic children and 56 controls found an 18% frequency of left-handedness in the dyslexic group.
    • Left-handed dyslexic children exhibited a higher frequency of neurological soft signs.
    • These findings align with hypotheses suggesting a shared dysgenetic brain origin for dyslexia and left-handedness, involving distorted cortical development in language-related areas.

    Impact:

    • Provides empirical support for theories linking dyslexia and left-handedness to atypical brain development.
    • Suggests that neurological soft signs may be valuable indicators in the assessment of dyslexia.
    • Highlights the potential for understanding developmental disorders through the lens of brain lateralization and cortical development.

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