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Related Experiment Videos

Voice onset time in ataxic dysarthria

H Ackermann1, I Hertrich

  • 1Department of Neurology, University of Tübingen, Germany.

Brain and Language
|February 15, 1997
PubMed
Summary

Patients with cerebellar atrophy showed altered voice onset time (VOT) for speech sounds. This resulted in difficulties distinguishing voiced and unvoiced consonants and increased misperceptions of spoken words.

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Area of Science:

  • Neuroscience
  • Speech Science
  • Acoustic Phonetics

Background:

  • Cerebellar atrophy can lead to ataxic syndromes affecting motor control.
  • Voice onset time (VOT) is a crucial acoustic cue for distinguishing consonant sounds.
  • Previous research suggests links between neurological disorders and VOT abnormalities.

Purpose of the Study:

  • To investigate voice onset time (VOT) in patients with cerebellar atrophy.
  • To determine if cerebellar damage impacts the acoustic distinction of stop consonants.
  • To assess the perceptual consequences of VOT alterations in ataxic speech.

Main Methods:

  • Acoustic analysis of voice onset time (VOT) in eight patients with cerebellar atrophy.
  • Production of German minimal pairs ('Daten' vs. 'Taten') to elicit target sounds.
  • Perceptual evaluation by listeners of recorded speech samples from patients and controls.

Main Results:

  • Cerebellar patients exhibited a reduced categorical distinction in VOT between voiced and unvoiced stop consonants.
  • Listeners frequently misidentified words produced by patients, particularly those with initial unvoiced plosives.
  • VOT disruptions in cerebellar patients showed some similarities to those observed in other neurological conditions.

Conclusions:

  • Cerebellar atrophy significantly impacts the production and perception of VOT.
  • Ataxic speech may present with VOT abnormalities affecting consonant categorization.
  • Similar VOT disruptions across different neurological disorders suggest potential shared or convergent pathomechanisms.

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