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Brain laterality: differences in cognitive style or motor function?

E H Galluscio

    Perceptual and Motor Skills
    |February 1, 1983
    PubMed
    Summary
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    Motor function influences brain laterality in males. Different motor responses, like key presses versus mouth switches, revealed distinct brain hemisphere advantages for visuospatial tasks, suggesting specialized motor control systems.

    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Motor Control

    Background:

    • Brain laterality, the specialization of brain hemispheres for different functions, is well-documented.
    • The influence of motor response systems on observable brain laterality is less understood.
    • Previous research often overlooks the effector system's role in cognitive task performance.

    Purpose of the Study:

    • To investigate the role of motor function in brain laterality.
    • To determine if different motor responses alter brain hemisphere activation during visuospatial tasks.
    • To explore the interplay between cognitive processing and motor output laterality.

    Main Methods:

    • Two studies were conducted on normal, familial, dextral males.
    • Visuospatial tasks (figure-matching, sequential-spatial) were employed.

    Related Experiment Videos

  • Motor responses were varied: manual key press versus microswitch activation via mouthpiece.

    • Main Results:

    • A right-brain advantage was observed for both tasks when using a manual key press.
    • A left-brain advantage emerged for the same tasks when responding via a mouthpiece microswitch.
    • These findings indicate hemisphere-specific motor control for effector systems.

    Conclusions:

    • Both brain hemispheres can process visuospatial information.
    • Motor response systems exhibit lateralized control, influencing observed brain activity.
    • Cognitive styles and effector system lateralization are key factors in brain laterality research.