Speech development enters a critical phase in the early elementary years, when learned patterns of phonology and motor control become increasingly entrenched, and developmental speech-language disorders become more difficult to treat. Much attention has been given to early speech development in the preschool years, and a few studies have examined the acoustics of speech development cross-sectionally from Kindergarten to adulthood. To the best of our knowledge, there are no longitudinal acoustic studies of the speech of typically developing children between 5 years and puberty. Although cross-sectional studies provide a general picture of growth, they cannot reveal specific patterns of development and variability. We present acoustic data from an annual, longitudinal study of 8 children between 6 and 10 years of age. All participants are native speakers of Midwest American English. Stimuli included words and sentences from the Goldman-Fristoe Test of Articulation 3rd Edition, as well as a spontaneous speech sample and nonce syllables embedded in a carrier phrase. Frequencies for the first four formants were obtained across the entire stimulus set with Praat, and used to generate formant frequency distributions for each child, in each year.
Development of formant frequency distributions in American English-speaking elementary school-aged children: A longitudinal study
Steven M. Lulich, Sherman D. Charles; Development of formant frequency distributions in American English-speaking elementary school-aged children: A longitudinal study. Proc. Mtgs. Acoust. 11 December 2020; 42 (1): 060016. https://doi.org/10.1121/2.0001459
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