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Disfluency in spasmodic dysphonia: a multivariate analysis

M P Cannito1, A R Burch, C Watts

  • 1University of Memphis, Tennessee, USA. mpcannito@cc.memphis.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|June 1, 1997
PubMed
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Disfluency in spasmodic dysphonia (SD) significantly impacts listener perception of severity. While not a defining feature, increased disfluency correlates with greater perceived severity in speakers with SD.

Area of Science:

  • Speech-Language Pathology
  • Clinical Linguistics
  • Auditory Perception

Background:

  • Spasmodic dysphonia (SD) is a voice disorder affecting speech production.
  • Listener perception of disfluency in SD is not fully understood.
  • Quantifying disfluency in SD is crucial for assessing severity.

Purpose of the Study:

  • To investigate listener judgments of disfluency in speakers with SD.
  • To identify acoustic and performance variables related to disfluency in SD.
  • To determine the contribution of disfluency to the perceived severity of SD.

Main Methods:

  • Normal listeners used visual analog scaling (VAS) to rate oral reading by speakers with SD and controls.
  • Variables measured included disfluency frequency, speaking rate, reading errors, and temporal acoustic measures.

Related Experiment Videos

  • Multivariate Analysis of Variance (MANOVA) and stepwise multiple regression were employed.

    • Main Results:

    • Significant differences in disfluency measures were found between SD and control speakers, except for reading errors.
    • Clinical ratings of dysphonia severity correlated with disfluency measures.
    • Frequency of disfluency, speaking rate, and reading errors explained over 75% of the variability in VAS disfluency judgments.

    Conclusions:

    • Disfluency, while not a defining characteristic of SD, significantly influences the listener's perception of the disorder's severity.
    • Acoustic and performance variables contribute to perceived disfluency in SD.
    • Listener judgments of disfluency are a key component in assessing SD severity.