Summary
Objectives
Differential diagnosis for adductor laryngeal dystonia (AdLD) is often carried out
by comparing symptom expression during sentences with either all voiced or voiced
and voiceless consonants. However, empirical research examining the effects of phonetic
context on symptoms is sparse. The purpose of this study was to examine whether symptom
probabilities varied across voiced speech segments in an all-voiced sentence, and
whether this variability was systematic with respect to phonetic features.
Methods
Eighteen speakers with AdLD read aloud a sentence comprised entirely of voiced speech
sounds. Speech segment boundaries and AdLD symptoms (phonatory breaks, frequency shifts,
and creak) were labeled separately, and speech segments were coded as symptomatic
or asymptomatic based on their temporal overlap. Generalized linear mixed effects
models with a binomial outcome variable were used to compare the probability of symptom
expression across: 1) all speech segments in the sentence, and 2) four speech sound
classes (vowels, approximants, nasals, and obstruents).
Results
Significant symptom variability was found across voiced speech segments in the sentence.
Furthermore, the estimated probability of a symptom occurring on vowels and approximants
was significantly greater than that of nasals and obstruents.
Conclusion
These results indicate that AdLD symptoms are not uniformly distributed across voiced
speech segments with systematic variation across speech sound classes.To explain these
findings, future work should investigate how the complex interactions between the
vocal tract articulators and glottal configurations may influence symptom expression
in this population.
Key words
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Article info
Publication history
Published online: November 21, 2022
Accepted:
October 5,
2022
Publication stage
In Press Corrected ProofIdentification
Copyright
© 2022 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
