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Speech lateralization assessed by concurrent task performance

K McFarland, G Geffen

    Neuropsychologia
    |January 1, 1982
    PubMed
    Summary
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    This study found that speech processing and production may not always be in the same brain hemisphere. Handedness and brain lateralization impact performance during concurrent speech and motor tasks.

    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Speech and Hearing Sciences

    Background:

    • The lateralization of brain functions, particularly speech, is a key area of research.
    • Understanding the relationship between speech processing, speech production, and motor control is crucial for cognitive neuroscience.

    Purpose of the Study:

    • To investigate the relationship between speech perception, speech production, and motor task performance.
    • To determine if speech perception and speech production mechanisms are always lateralized to the same hemisphere.
    • To examine the impact of concurrent speech tasks on manual motor performance in relation to brain lateralization.

    Main Methods:

    • A sequential button pressing task was administered using either the left or right hand.
    • Participants concurrently performed a speech task.

    Related Experiment Videos

  • Brain lateralization for speech was assessed using a dichotic monitoring task.

    • Main Results:

    • Subjects with left-hemisphere speech representation showed a lateralized practice effect: left-hand performance improved with concurrent speech, while right-hand performance did not.
    • Subjects with right-hemisphere speech representation experienced disruption in performance for either hand during the concurrent speech task, with no lateralized practice effect observed.
    • Discriminant analysis correctly classified 93% of subjects based on speech perception lateralization using performance measures from the concurrent tasks.

    Conclusions:

    • Speech perception and speech production mechanisms are not necessarily concordantly lateralized.
    • Concurrent cognitive tasks can reveal insights into the functional lateralization of speech and motor control.
    • Performance patterns in concurrent tasks can accurately predict the cerebral lateralization of speech perception.