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Feature analysis of singleton consonant errors in developmental verbal dyspraxia (DVD)
G Thoonen1, B Maassen, F Gabreëls
1Child Neurology Center/Institute Medical Psychology, University Hospital Nijmegen, The Netherlands.
Journal of Speech and Hearing Research
|December 1, 1994
Summary
This study quantifies diagnostic features of developmental verbal dyspraxia (DVD) in children. While DVD involves significant consonant errors, speech profiles closely resemble those of children with typical speech development.
Area of Science:
- Speech-language pathology
- Linguistics
- Developmental psychology
Background:
- Developmental verbal dyspraxia (DVD) is a complex speech sound disorder.
- Accurate diagnosis relies on understanding specific error patterns in consonant production.
- Quantifying these errors is crucial for effective intervention.
Purpose of the Study:
- To quantify diagnostic characteristics of consonant production in children with DVD.
- To analyze consonant substitution and omission errors using feature-value analysis.
- To compare error patterns in DVD with typically developing children.
Main Methods:
- Selected 11 children with DVD based on strict criteria.
- Conducted phonetic transcription of consonant productions in imitation tasks.
- Utilized confusion matrices for feature and feature-value analysis of errors.
Main Results:
- Children with DVD exhibited low retention rates for place, manner, and voicing features.
- Place of articulation errors in words correlated with DVD severity.
- High substitution and omission rates were observed, alongside inconsistent feature realization.
- Syntagmatic error rates were notably high in children with DVD.
Conclusions:
- DVD diagnosis requires analysis of overall speech profiles, not isolated symptoms.
- Despite higher error rates, DVD and typical speech profiles show qualitative similarities.
- Findings support the hypothesis of DVD as a phonological encoding deficit.