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Related Experiment Videos

Brain function and writing with the unaccustomed left hand.

G A Dawson

    Journal of Forensic Sciences
    |January 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

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    Document examiners can identify differences in handwriting between a person's dominant and non-dominant hands. These persistent changes in handprinting are linked to reduced dexterity and distinct neurophysiological processes.

    Area of Science:

    • Forensic Science
    • Neuroscience
    • Human Physiology

    Background:

    • Handwriting analysis is crucial in document examination.
    • Understanding variations in handwriting based on hand dominance is essential for accurate forensic analysis.

    Purpose of the Study:

    • To document expected changes in handprinting when using the unaccustomed left hand.
    • To hypothesize the underlying reasons for these observed handwriting differences.

    Main Methods:

    • Twenty right-handed subjects participated in the study.
    • Participants were instructed to handprint a pangram (a sentence containing all letters of the alphabet) with both their right and left hands.

    Main Results:

    • Persistent, observable differences were noted between the right-hand and left-hand writings of many subjects.

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  • These variations were consistent across multiple writing samples from the same individual.

    • Conclusions:

    • Handwriting produced with the non-dominant left hand often exhibits distinct characteristics compared to dominant hand writing.
    • These differences are attributed to reduced manual dexterity and the involvement of different neurophysiological pathways during unaccustomed hand use.