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A multigenerational family study of oral and hand motor sequencing ability provides evidence for a familial speech sound disorder subtype


, : A multigenerational family study of oral and hand motor sequencing ability provides evidence for a familial speech sound disorder subtype. Topics in Language Disorders 31(2): 145-167

PURPOSE: To evaluate phenotypic expressions of speech sound disorder (SSD) in multigenerational families with evidence of familial forms of SSD. METHOD: Members of five multigenerational families (N = 36) produced rapid sequences of monosyllables and disyllables and tapped computer keys with repetitive and alternating movements. RESULTS: Measures of repetitive and alternating motor speed were correlated within and between the two motor systems. Repetitive and alternating motor speeds increased in children and decreased in adults as a function of age. In two families with children who had severe speech deficits consistent with disrupted praxis, slowed alternating, but not repetitive, oral movements characterized most of the affected children and adults with a history of SSD, and slowed alternating hand movements were seen in some of the biologically related participants as well. CONCLUSION: Results are consistent with a familial motor-based SSD subtype with incomplete penetrance, motivating new clinical questions about motor-based intervention not only in the oral but also the limb system.

US$19.90

PMID: 21909176

DOI: 10.1097/TLD.0b013e318217b855


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