Diagnosing inconsistent phonological disorder : Quantitative and qualitative measures

Journal article


Dodd, Barbara, McIntosh, Beth, Crosbie, Sharon and Holm, Alison. (2023). Diagnosing inconsistent phonological disorder : Quantitative and qualitative measures. Clinical Linguistics & Phonetics. 38(5), pp. 453-476. https://doi.org/10.1080/02699206.2023.2224916
AuthorsDodd, Barbara, McIntosh, Beth, Crosbie, Sharon and Holm, Alison
Abstract

Studies of children’s consistency of word production allow identification of speech sound disorder. Inconsistent errors are reported for two groups of children: childhood apraxia of speech (CAS) due to difficulty with the motoric precision and consistency of speech movements; and inconsistent phonological disorder (IPD) attributed to impaired phonological planning. This paper describes the inconsistent productions of children with IPD in comparison to typically developing children. In two studies of suspected SSD (N = 135), 22 children pronounced ≥40% of 25 words inconsistently on three repeated trials. No participant had symptoms of CAS. They were monolingual and spoke Australian- or Irish-English. Assessment determined the proportions of words said consistently (i.e. the same across productions: all correct or with the same error) or inconsistently (i.e. differently across productions: at least one correct and one error or different errors in productions). Qualitative analyses examined error types and explored the effect of target words’ characteristics on inconsistency. Children with IPD produced 52% of words with different errors. While 56% of all phoneme errors were developmental (age appropriate or delayed), atypical errors typified inconsistency: default sounds and word structure errors. Words with more phonemes, syllables and consonant clusters were vulnerable to inconsistency, but their frequency of occurrence had no effect. TD children and those with IPD had different quantitative and qualitative error profiles, confirming IPD as a diagnostic category of SSD. Qualitative analyses supported the hypothesised deficit in phonological planning of words’ production for children with IPD.

Keywordsinconsistency; speech sound disorder; qualitative measures; differential diagnosis
Year2023
JournalClinical Linguistics & Phonetics
Journal citation38 (5), pp. 453-476
PublisherTaylor & Francis
ISSN0269-9206
Digital Object Identifier (DOI)https://doi.org/10.1080/02699206.2023.2224916
PubMed ID37382651
Scopus EID2-s2.0-85163743810
Open accessPublished as ‘gold’ (paid) open access
Page range453-476
FunderNational Health and Medical Research Council (NHMRC)
Publisher's version
License
File Access Level
Open
Output statusPublished
Publication dates
Online29 Jun 2023
Publication process dates
Accepted05 Jun 2023
Deposited02 Apr 2025
Grant IDGNT1153614
Additional information

© 2023 The Author(s). Published with license by Taylor & Francis Group, LLC.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The terms on which this article has been published allow the posting of the Accepted Manuscript in a repository by the author(s) or with their consent.

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