Affiliation:
1. Department of Audiology and Speech-Language Pathology, University of North Texas, Denton
2. School of Psychology, Speech and Hearing, University of Canterbury, New Zealand
Abstract
Purpose
The frequency of a word and its number of phonologically similar neighbors can dramatically affect how likely it is to be accurately identified in adverse listening conditions. This study compares how these two cues affect listeners' processing of speech in noise and dysarthric speech.
Method
Seven speakers with moderate hypokinetic dysarthria and eight healthy control speakers were recorded producing the same set of phrases. Statements from control speakers were mixed with noise at a level selected to match the intelligibility range of the speakers with dysarthria. A binomial mixed-effects model quantified the effects of word frequency and phonological density on word identification.
Results
The model revealed significant effects of word frequency (
b
= 0.37,
SE
= 0.12,
p
= .002) and phonological neighborhood density (
b
= 0.40,
SE
= 0.12,
p
= .001). There was no effect of speaking condition (i.e., dysarthric speech vs. speech in noise). However, a significant interaction was observed between speaking condition and word frequency (
b
= 0.26,
SE
= 0.04,
p
< .001).
Conclusions
The model's interactions indicated that listeners were more strongly influenced by the effects of word frequency when decoding moderate hypokinetic dysarthria as compared to speech in noise. Differences in listener reliance on lexical cues may have important implications for the selection of communication-based treatment strategies for speakers with dysarthria.
Publisher
American Speech Language Hearing Association
Subject
Speech and Hearing,Linguistics and Language,Developmental and Educational Psychology,Otorhinolaryngology
Cited by
3 articles.
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