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Ataxic dysarthria.

R D Kent1, J F Kent, J R Duffy

  • 1University of Wisconsin-Madison, 53705-2280, USA. kentray@waisman.wisc.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|November 4, 2000
PubMed
Summary
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Ataxic dysarthria affects speech consistency, with long-term fundamental frequency variability being a key acoustic abnormality. Speaking tasks reveal irregular syllable rates and variable intelligibility, indicating impaired speech motor control.

Area of Science:

  • Neurology
  • Speech-Language Pathology
  • Acoustic Phonetics

Background:

  • Ataxic dysarthria is a motor speech disorder characterized by disrupted articulation and prosody.
  • Previous research has explored various acoustic and perceptual features, but consistency and task sensitivity remain unclear.

Purpose of the Study:

  • To identify consistent acoustic and perceptual features of ataxic dysarthria.
  • To determine the most sensitive speaking tasks for assessing the disorder.
  • To investigate uniform effects across speech subsystems.

Main Methods:

  • Acoustic and perceptual analyses of speech tasks (vowel phonation, syllable repetition, sentence recitation, conversation) from 14 individuals with ataxic dysarthria.
  • Multidimensional acoustic measures including fundamental frequency variability, shimmer, jitter, and peak amplitude variation.

Related Experiment Videos

  • Analysis of syllable alternating motion rate (AMR) and intelligibility in conversational speech.

    • Main Results:

    • Long-term fundamental frequency variability was the most frequent abnormality in sustained vowel phonation.
    • Shimmer, peak amplitude variation, and jitter also showed high abnormality rates.
    • Syllable alternating motion rate was slow and irregular, with high variability across repetitions, suggesting respiratory and articulatory control issues.
    • Articulatory hypometria was not pervasive, as formant-frequency ranges were largely normal during sentence production.
    • Conversational intelligibility varied significantly, with some individuals maintaining acoustic contrasts despite deficits.

    Conclusions:

    • Long-term fundamental frequency variability is a hallmark acoustic feature of ataxic dysarthria.
    • Irregular syllable timing and respiratory/articulatory control deficits are evident in tasks like AMR.
    • While articulation may be preserved in some aspects, overall speech intelligibility is affected by variable acoustic contrasts and timing irregularities.