Abstract
The purpose of this study was to investigate changes in the acoustic structure of a child’s vowels during early language development. Recordings were made of a child’s speech at approximately two month intervals from 17 months to 29 months. The first and second formants of all identifiable English front and back vowels were analyzed spectrographically and subsequently plotted on an F1-F2 plane. The data suggest that vowel formants shift over time towards a more precisely defined vowel space, implying that articulatory proficiency changes in accord with maturation.
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