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Hand preference in sequential and spatial discrimination tasks.

I Nachshon, A Carmon

    Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
    |June 1, 1975
    PubMed
    Summary
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    Right-hand preference emerged in bimanual sequential tasks, while left-hand preference appeared in bimanual spatial tasks. Unimanual tasks showed no hand preference, suggesting hemispheric specialization for complex actions.

    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Human Motor Control

    Background:

    • Hand preference is a common human trait, but its manifestation in complex sensorimotor tasks is not fully understood.
    • Hemispheric lateralization for cognitive functions is well-established, yet its specific role in bimanual task performance requires further investigation.

    Purpose of the Study:

    • To investigate hand preference in sensorimotor discrimination tasks.
    • To compare the sequential and spatial abilities of the left and right hands.
    • To explore the influence of unimanual versus bimanual performance on hand preference.

    Main Methods:

    • Eighty right-handed subjects participated in four experiments involving sequential and spatial tasks.
    • Tasks were performed either unimanually or bimanually.

    Related Experiment Videos

  • Performance metrics were analyzed to determine hand preference and task-specific abilities.

    • Main Results:

    • Subjects exhibited a right-hand advantage in bimanual sequential tasks.
    • A left-hand advantage was observed in bimanual spatial tasks.
    • No significant hand preference was detected during unimanual task performance.

    Conclusions:

    • The findings suggest distinct sensorimotor dominance of the cerebral hemispheres for sequential and spatial processing.
    • Right hemisphere dominance may be associated with spatial tasks, while left hemisphere dominance is linked to sequential tasks.
    • Bimanual performance reveals lateralized sensorimotor control, unlike unimanual tasks.