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Related Experiment Videos

Dysprosody in Broca's aphasia: a case study.

J Gandour1, S H Petty, R Dardarananda

  • 1Department of Audiology and Speech Sciences, Purdue University, West Lafayette, IN 47907.

Brain and Language
|August 1, 1989
PubMed
Summary

Speech timing, not tone, is impaired in Broca's aphasia. This study analyzed acoustic features in Thai speakers, finding timing deficits related to linguistic structure complexity.

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Area of Science:

  • Linguistics
  • Neurolinguistics
  • Speech Science

Background:

  • Broca's aphasia is a language disorder affecting speech production.
  • Dysprosody, or impaired rhythm and intonation, is a common symptom.
  • Thai, a tonal language, provides a unique model for studying prosody.

Observation:

  • Acoustic analysis of speech from a Thai speaker with Broca's aphasia.
  • Examined timing, intensity, and fundamental frequency (F0) across linguistic levels (syllables, phrases, sentences).
  • Thai tones were analyzed in isolated words and connected speech.

Findings:

  • Speech timing was impaired, varying with articulatory complexity and linguistic structure size.
  • Sentence-level timing and intensity were aberrant.
  • Fundamental frequency contours for Thai tones remained intact across all linguistic levels.

Implications:

  • Dysprosody in Broca's aphasia primarily affects speech timing mechanisms.
  • Findings suggest distinct neural substrates for timing and tonal control in speech.
  • Highlights the importance of analyzing prosodic deficits in tonal language speakers with aphasia.

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