Key result
A critical examination of earlier and recent studies indicates that a familial predisposing factor exists in approximately 25% of stuttering cases.
This review highlights substantial evidence supporting a familial predisposing factor in approximately 25% of stuttering cases.
Hypothesized genetic basis for stuttering sex ratio warrants investigation; leaves open confirmation in contemporary genetic studies.
In the light of recent breakthrough in the study of schizophrenia indicating a far stronger genetic factor than has been previously suspected, the role of heredity in stuttering is critically reexamined. Present knowledge of the role of heredity in stuttering springs from four principal data sources: (1) studies of familial incidence; (2) spontaneous recovery studies; (3) twin studies; and (4) studies of parental disfluency. It is hypothesized that the 4:1 sex ratio in stuttering may be the product of selective genetic factors. Critical examination of earlier and more recent studies leads to substantial evidence that a familial predisopsing factor exists in about 25% cases of stuttering.
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Sheehan et al. (1977) conducted a review in Stuttering. Heredity / Genetic factors was evaluated on Familial predisposing factor. A critical examination of earlier and recent studies indicates that a familial predisposing factor exists in approximately 25% of stuttering cases.
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