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Related Experiment Videos

Stuttering and tics in twins.

U Godai, R Tatarelli, G Bonanni

    Acta Geneticae Medicae Et Gemellologiae
    |January 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    This study investigated the genetic basis of stuttering and tics in twins. Findings suggest a genetic component for both conditions, with a higher incidence in males and potential familial links to stuttering.

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    Area of Science:

    • Neuroscience
    • Genetics
    • Developmental Psychology

    Background:

    • Stuttering and tics are neurodevelopmental disorders with complex etiologies.
    • Twin studies are crucial for disentangling genetic and environmental influences.

    Purpose of the Study:

    • To investigate the concordance rates of stuttering and tics in monozygotic (MZ) and dizygotic (DZ) twins.
    • To explore potential associations between stuttering, tics, and other factors like language disturbances, IQ, and handedness.
    • To examine the sex ratio and familial incidence of stuttering and tics.

    Main Methods:

    • Analysis of 63 twin pairs (22 MZ, 41 DZ) from the Mendel Institute's twin file.
    • Data collection on affected individuals with stuttering and/or tics.
    • Statistical comparison of concordance rates between MZ and DZ twins.

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    Main Results:

    • Higher concordance rates for stuttering (10:12 MZ vs. 2:19 DZ) and tics (6:10 MZ vs. 2:22 DZ) in MZ twins, suggesting genetic influence.
    • Stuttering was not significantly associated with language disturbances or low IQ.
    • A male predominance was observed for both stuttering (32:12) and tics (27:12).
    • Increased incidence of stutterers and left-handers in families of stuttering subjects compared to families of subjects with tics.

    Conclusions:

    • Genetic factors likely play a significant role in the etiology of stuttering and tics.
    • Environmental factors may precipitate stuttering.
    • Further research is needed to clarify the relationship between stuttering and tics, and to understand familial patterns.