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Alpha hemispheric asymmetry and stuttering: some support for a segmentation dysfunction hypothesis

W H Moore, W O Haynes

    Journal of Speech and Hearing Research
    |June 1, 1980
    PubMed
    Summary
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    Male stutterers exhibit reduced right-hemisphere alpha activity during speech and non-speech tasks, suggesting potential hemispheric processing differences. This may indicate stuttering is linked to linguistic segmentation dysfunction.

    Area of Science:

    • Neuroscience
    • Speech and Language Pathology
    • Cognitive Psychology

    Background:

    • Understanding hemispheric asymmetries is crucial for deciphering brain function in speech disorders.
    • Previous research suggests differences in brain activity patterns between typical speakers and individuals who stutter.

    Purpose of the Study:

    • To investigate alpha hemispheric asymmetries in normal-speaking males, normal-speaking females, and male stutterers.
    • To explore these asymmetries during both verbal and nonverbal tasks using electroencephalographic (EEG) techniques.
    • To test the hypothesis that stuttering may stem from a linguistic segmentation dysfunction.

    Main Methods:

    • Electroencephalographic (EEG) recordings were used to measure brain activity.
    • Participants included normal-speaking males, normal-speaking females, and male stutterers, with controlled familial handedness.

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  • Subjects were exposed to connected speech and connected nonlinguistic stimuli.

    • Main Results:

    • Male stutterers demonstrated significantly less alpha activity in their right hemispheres compared to controls.
    • This reduction in right-hemisphere alpha was observed during both verbal and nonverbal tasks.
    • Findings suggest altered hemispheric processing in male stutterers.

    Conclusions:

    • The study provides evidence for distinct patterns of hemispheric processing in male stutterers.
    • Reduced right-hemisphere alpha activity may be a neural correlate of stuttering.
    • The findings support the hypothesis that stuttering could be related to difficulties in linguistic segmentation.