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Related Experiment Videos

Left-handedness and cognitive deficit.

C Hardyck, L F Petrinovich, R D Goldman

    Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
    |September 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

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    Intellectual and cognitive performance shows no significant difference between right-handed and left-handed individuals. This study of 7688 children supports the hypothesis of no performance deficit in left-handedness.

    Area of Science:

    • Cognitive Psychology
    • Neuroscience
    • Human Development

    Background:

    • Previous research has explored potential links between handedness and cognitive abilities.
    • Concerns about possible deficits in left-handed individuals have been a subject of debate.

    Purpose of the Study:

    • To investigate the relationship between handedness, eyedness, and intellectual/performance measures in a large sample of school children.
    • To critically evaluate the hypothesis of cognitive deficits in left-handedness.

    Main Methods:

    • Administered intellectual and performance tests to 7688 school children.
    • Assessed handedness (three behavioral measures) and eyedness (one measure).
    • Compared results across handedness/eyedness combinations and socio-economic level.

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    Main Results:

    • No significant relationships were found between handedness, eyedness, and intellectual or performance measures.
    • Analysis included comparisons with 33 prior studies on left-handedness deficits.

    Conclusions:

    • The findings strongly support the hypothesis that there are no differences in intellectual and cognitive performance between right- and left-handed individuals.
    • The study suggests that claims of deficits associated with left-handedness are not supported by the evidence.