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Hemispheric lateralization for speech perception in stutterers.

M F Dorman, R J Porter

    Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
    |June 11, 1975
    PubMed
    Summary
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    This study found that stutterers and non-stutterers show similar patterns of right-ear advantage in speech perception, indicating no difference in cerebral speech lateralization between the groups.

    Area of Science:

    • Neuroscience
    • Speech and Hearing Sciences
    • Psycholinguistics

    Background:

    • Stuttering is a complex speech disorder.
    • Theories have proposed that abnormal cerebral lateralization for speech may underlie stuttering.
    • Previous research has yielded mixed results regarding speech lateralization in individuals who stutter.

    Purpose of the Study:

    • To investigate hemispheric lateralization for speech in adults who stutter compared to non-stuttering controls.
    • To test the hypothesis that differences in cerebral speech lateralization contribute to stuttering.

    Main Methods:

    • A dichotic nonsense-syllable test was administered to 16 adults who stutter and 20 non-stuttering controls.
    • Participants were right-handed, and included both males and females.

    Related Experiment Videos

  • Syllable identification accuracy was measured for each ear to determine auditory processing lateralization.

    • Main Results:

    • Both stutterers and non-stutterers demonstrated a similar right-ear advantage (REA) in syllable identification.
    • The magnitude of the REA was comparable between the stuttering and control groups.
    • No significant differences in speech lateralization were observed between male and female stutterers and controls.

    Conclusions:

    • The findings support previous reports indicating no difference in cerebral speech lateralization between stutterers and non-stutterers.
    • These results do not lend support to theories linking stuttering to abnormalities in cerebral lateralization for speech.
    • Auditory processing and speech lateralization appear to be organized similarly in individuals who stutter and those who do not.