Task-related factors in oral motor control: speech and oral diadochokinesis in dysarthria and apraxia of speech

Brain Lang. 2002 Mar;80(3):556-75. doi: 10.1006/brln.2001.2614.


This study was focused on the potential influence of task-related factors on oral motor performance in patients with speech disorders. Sentence production was compared with a nonspeech oral motor task, i.e., oral diadochokinesis. Perceptual and acoustic measures of speech impairment were used as dependent variables. Between-task comparisons were made for subsamples of a population of 140 patients with different motor speech syndromes, including apraxia of speech and cerebellar dysarthria. In a further analysis subgroups were matched for speaking rate. Overall, dysdiadochokinesis was correlated with the degree of speech impairment, but there was a strong interaction between task type and motor speech syndrome. In particular, cerebellar pathology affected DDK to a relatively greater extent than sentence production, while apraxic pathology spared the ability of repeating syllables at maximum speed.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Apraxias / diagnosis*
  • Apraxias / physiopathology*
  • Dysarthria / diagnosis*
  • Dysarthria / physiopathology*
  • Humans
  • Middle Aged
  • Speech / physiology*
  • Speech Acoustics
  • Tongue / physiopathology*
  • Verbal Behavior / physiology*