Prevalence and phenotype of childhood apraxia of speech in youth with galactosemia

Lawrence D. Shriberg, Nancy L. Potter, Edythe A. Strand

Research output: Contribution to journalArticlepeer-review

81 Scopus citations


Purpose: In this article, the authors address the hypothesis that the severe and persistent speech disorder reported in persons with galactosemia meets contemporary diagnostic criteria for Childhood Apraxia of Speech (CAS). A positive finding for CAS in this rare metabolic disorder has the potential to impact treatment of persons with galactosemia and inform explanatory perspectives on CAS in neurological, neurodevelopmental, and idiopathic contexts. Method: Thirty-three youth with galactosemia and significant prior or persistent speech sound disorder were assessed in their homes in 17 states. Participants completed a protocol yielding information on their cognitive, structural, sensorimotor, language, speech, prosody, and voice status and function. Results: Eight of the 33 participants (24%) met contemporary diagnostic criteria for CAS. Two participants, 1 of whom was among the 8 with CAS, met criteria for ataxic or hyperkinetic dysarthria. Groupwise findings for the remaining 24 participants are consistent with a classification category termed Motor Speech Disorder-Not Otherwise Specified (Shriberg, Fourakis et al., 2010a). Conclusion: The authors estimate the prevalence of CAS in galactosemia at 18 per hundred-180 times the estimated risk for idiopathic CAS. Findings support the need to study risk factors for the high occurrence of motor speech disorders in galactosemia despite early compliant dietary management.

Original languageEnglish (US)
Pages (from-to)487-519
Number of pages33
JournalJournal of Speech, Language, and Hearing Research
Issue number2
StatePublished - Apr 1 2011


  • Apraxia
  • Dyspraxia
  • Genetics
  • Motor speech disorder
  • Speech sound disorder

ASJC Scopus subject areas

  • Language and Linguistics
  • Linguistics and Language
  • Speech and Hearing


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