The role of genetic factors in the onset and maintenance of stuttering has received considerable attention.
Multiple studies have shown that stuttering runs in families and that approximately 70% of the variance in liability to stutter can be accounted for through inheritable factors. The contribution of congenital factors and early neurological incidents has been less thoroughly investigated but research has suggested that both may be causal factors for some individuals who stutter, especially those with no family history of stuttering. Furthermore, it has been suggested that when no genetic component is present, adults who stutter are more likely to present with increased ADHD-like characteristics possibly as a result of underlying neurological factors.
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