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Speech rate reduction and "nasality" in normal speakers.

T M Brancewicz1, A R Reich

  • 1University of Washington.

Journal of Speech and Hearing Research
|December 1, 1989
PubMed
Summary

Reduced speech rate did not affect nasal/voice accelerometric measures in adults. Listener ratings showed minor speech rate effects, but poorly correlated with accelerometric data.

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Area of Science:

  • Speech Science
  • Acoustic Phonetics
  • Speech Motor Control

Background:

  • Understanding the relationship between speech production mechanics and perceptual qualities is crucial.
  • Nasal/voice accelerometry offers an objective measure of laryngeal and nasal airflow.
  • Investigating the impact of speaking rate on these measures is essential for clinical and research applications.

Purpose of the Study:

  • To investigate the effects of reduced speech rate on nasal/voice accelerometric measures.
  • To compare these objective measures with subjective nasality ratings from experienced listeners.
  • To determine the correlation between acoustic/mechanical speech parameters and perceived nasality.

Main Methods:

  • Adult participants produced various speech stimuli (sentences, syllable trains) at different speaking rates (normal, reduced, computer-paced).
  • Nasal/voice accelerometric data were collected during speech production.
  • Listeners provided nasality ratings for the recorded speech samples.

Main Results:

  • Nasal/voice accelerometric measures showed significant effects related to speech stimulus but not speaking rate.
  • Listener nasality ratings exhibited small but significant effects for both stimulus and speaking rate.
  • A poor correlation was found between the objective accelerometric measures and the subjective nasality ratings.

Conclusions:

  • Speaking rate does not appear to significantly alter nasal/voice accelerometric output in normal speakers.
  • Subjective perception of nasality is influenced by speaking rate, though weakly.
  • Nasal/voice accelerometry may not reliably reflect perceived nasality, especially across different speaking rates.

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