The Specific Relation Between Perception and Production Errors for Place of Articulation in Developmental Apraxia of Speech

P.A.P. Groenen · Ben Maassen · Thom A. M. Crul · Geert H.J. Thoonen

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Language Development and Disorders Phonetics and Phonology Research Neurobiology of Language and Bilingualism

Abstract

Developmental apraxia of speech is a disorder of phonological and articulatory output processes. However, it has been suggested that perceptual deficits may contribute to the disorder. Identification and discrimination tasks offer a fine-grained assessment of central auditory and phonetic functions. Seventeen children with developmental apraxia (mean age 8:9, years:months) and 16 control children (mean age 8:0) were administered tests of identification and discrimination of resynthesized and synthesized monosyllabic words differing in place-of-articulation of the initial voiced stop consonants. The resynthetic and synthetic words differed in the intensity of the third formant, a variable potentially enlarging their clinical value. The results of the identification task showed equal slopes for both subject groups, which indicates no phonetic processing deficit in developmental apraxia of speech. The hypothesized effect of the manipulation of the intensity of the third formant of the stimuli was not substantiated. However, the children with apraxia demonstrated poorer discrimination than the control children, which suggests affected auditory processing. Furthermore, analyses of discrimination performance and articulation data per apraxic subject demonstrated a specific relation between the degree to which auditory processing is affected and the frequency of place-of-articulation substitutions in production. This indicates the interdependence of perception and production. The results also suggest that the use of perceptual tasks has significant clinical value.

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References

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2009Speech perception in children with speech output disorders 2001Identification and discrimination of voicing and place-of-articulation in developmental dyslexia 2018Interventions for childhood apraxia of speech 2014Auditory–motor interactions in pediatric motor speech disorders: Neurocomputational modeling of disordered development 2001Prosody-voice characteristics of children and adults with apraxia of speech

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