Effect of speech task on intelligibility in dysarthria: A case study of Parkinson's disease

Daniel Kempler, Diana Van Lancker

Research output: Contribution to journalArticlepeer-review


This study assessed intelligibility in a dysarthric patient with Parkinson's disease (PD) across five speech production tasks: spontaneous speech, repetition, reading, repeated singing, and spontaneous singing, using the same phrases for all but spontaneous singing. The results show that this speaker was significantly less intelligible when speaking spontaneously than in the other tasks. Acoustic analysis suggested that relative intensity and word duration were not independently linked to intelligibility, but dysfluencies (from perceptual analysis) and articulatory/resonance patterns (from acoustic records) were related to intelligibility in predictable ways. These data indicate that speech production task may be an important variable to consider during the evaluation of dysarthria. As speech production efficiency was found to vary with task in a patient with Parkinson's disease, these results can be related to recent models of basal ganglia function in motor performance.

Original languageEnglish (US)
Pages (from-to)449-464
Number of pages16
JournalBrain and Language
Issue number3
StatePublished - 2002


  • Dysarthria
  • Intelligibility
  • Parkinson's
  • Reading
  • Repetition
  • Singing
  • Speech

ASJC Scopus subject areas

  • Language and Linguistics
  • Experimental and Cognitive Psychology
  • Linguistics and Language
  • Cognitive Neuroscience
  • Speech and Hearing


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