Dramatic effects of speech task on motor and linguistic planning in severely dysfluent parkinsonian speech

Diana Van Lancker Sidtis, Krista Cameron, John J. Sidtis

Research output: Contribution to journalArticlepeer-review


In motor speech disorders, dysarthric features impacting intelligibility, articulation, fluency and voice emerge more saliently in conversation than in repetition, reading or singing. A role of the basal ganglia in these task discrepancies has been identified. Further, more recent studies of naturalistic speech in basal ganglia dysfunction have revealed that formulaic language is more impaired than novel language. This descriptive study extends these observations to a case of severely dysfluent dysarthria due to a parkinsonian syndrome. Dysfluencies were quantified and compared for conversation, two forms of repetition, reading, recited speech and singing. Other measures examined phonetic inventories, word forms and formulaic language. Phonetic, syllabic and lexical dysfluencies were more abundant in conversation than in other task conditions. Formulaic expressions in conversation were reduced compared to normal speakers. A proposed explanation supports the notion that the basal ganglia contribute to formulation of internal models for execution of speech.

Original languageEnglish (US)
Pages (from-to)695-711
Number of pages17
JournalClinical Linguistics and Phonetics
Issue number8
StatePublished - Aug 2012


  • Basal ganglia
  • Dysfluency
  • Motor speech planning
  • Parkinson's disease
  • Task effects

ASJC Scopus subject areas

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


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