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Speech Apraxia can effect vowels, but how and why. This fascinating podcast win which we interview Dr Nicole Whitworth, a vowel expert explains all.
Dr Nicole Whitworth's research focuses on speech acquisition, vowel production, multilingual speech development, and the pedagogy of phonetics and clinical linguistics.
Here are some references that may be useful to accompany this podcast and a video that explains what waveforms, spectra and spectrograms are in briefhttps://youtu.be/M-ko3D9nEog.
Ball, M. J. and Gibbon, F. E. eds. (2013) Handbook of vowels and vowel disorders. Language and speech disorders book series. New York & London: Psychology.
Bates, S. and Titterington, J. (2021) Good practice guidelines for the analysis of child speech.
Bowen, C. (2023) Children's speech sound disorders. Third edition ed.: Wiley-Blackwell.
Jacks, A., Marquardt, T. P. and Davis, B. L. (2013) Vowel production in childhood and acquired apraxia of speech. In: Handbook of Vowels and Vowel Disorders. Psychology Press, pp. 326–346.
Kent, R. D. and Rountrey, C. (2020) What Acoustic Studies Tell Us About Vowels in Developing and Disordered Speech. American Journal of Speech-Language Pathology, 29(3), pp. 1749–1778. <doi: https://doi.org/10.1044/2020_AJSLP-19-00178>.
Knežević, D. and Maassen, B. (2025) Phonological and speech motor abilities in children with childhood apraxia of speech. Clinical Linguistics & Phonetics, 39(4-5) 2025/05/04, pp. 311–329. <doi: 10.1080/02699206.2024.2446825>.
Lenoci, G., Celata, C., Ricci, I., Chilosi, A. and Barone, V. (2021) Vowel variability and contrast in Childhood Apraxia of Speech: acoustics and articulation. Clinical Linguistics and Phonetics, 35(11) Nov 2, pp. 1011–1035. <doi: 10.1080/02699206.2020.1853811>.
Pollock, K. and Stoel‐Gammon, C. (2024) Vowel Development and Disorders. The Handbook of Clinical Linguistics, Second Edition, pp. 391–406.
Swartz, M. T. (2022) Exploring vowel space metrics and quality of life measures in adolescents with typical speech, residual speech sound disorder, and childhood apraxia of speech. Montclair State University.
Terband, H. and Bhat, B. (2025) Intrinsic Fundamental Frequency of Vowels in Children with Childhood Apraxia of Speech. Folia Phoniatrica et Logopaedica. <doi: 10.1159/000545595>.
