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Related Experiment Videos

Bilateral writing ability, cerebral organization, and hand posture.

A L Combs, D A Beezley, G M Prater

    Perceptual and Motor Skills
    |December 1, 1979
    PubMed
    Summary

    Individuals who can write with both hands do not use a hooked hand posture. This study found normal brain hemisphere balance in ambidextrous writers, suggesting implications for writing posture and cerebral organization.

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    Area of Science:

    • Neuroscience
    • Human Physiology
    • Writing Mechanics

    Background:

    • Ambidexterity, the ability to use both hands with equal skill, is a rare trait.
    • The relationship between handedness, cerebral lateralization, and writing posture is not fully understood.
    • Previous research has not extensively explored the hand posture of ambidextrous individuals.

    Purpose of the Study:

    • To investigate the hand posture used by individuals proficient in writing with both hands.
    • To assess the cognitive abilities (verbal and manipulospatial) associated with ambidextrous writers.
    • To explore the implications of these findings for understanding cerebral organization and writing mechanics.

    Main Methods:

    • Selection of 12 participants with demonstrated ambidextrous writing ability.

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  • Observation and documentation of hand posture during writing for both right and left hands.
  • Administration of tests to evaluate verbal and manipulospatial abilities.
  • Analysis of results in relation to established theories of cerebral lateralization.

    • Main Results:

    • None of the 12 ambidextrous writers exhibited a hooked hand posture with either hand.
    • Participants displayed a balanced profile of verbal and manipulospatial abilities, typical of the general population.
    • No significant lateralization of cognitive functions was observed in relation to writing hand.

    Conclusions:

    • Ambidextrous writing ability does not necessitate or correlate with a hooked hand posture.
    • The findings suggest that ambidextrous individuals possess a typical cerebral organization regarding language and spatial processing.
    • Further research is warranted to explore the neurobiological underpinnings of ambidexterity and its influence on motor skills like writing.