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Phonetic inventories, 15-24 months: a longitudinal study.

C Stoel-Gammon

    Journal of Speech and Hearing Research
    |December 1, 1985
    PubMed
    Summary

    This study tracked consonant sound development in 34 children from 15 to 24 months. Early speech sound production, particularly initial consonants, showed predictable patterns in children

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    Area of Science:

    • Child language acquisition
    • Phonological development
    • Speech sound development

    Background:

    • Understanding early phonological development is crucial for identifying developmental trajectories.
    • Longitudinal data provides insights into the emergence and progression of speech sounds.

    Purpose of the Study:

    • To analyze the range and types of consonantal phones in normally developing children.
    • To map the development of word-initial and word-final consonant inventories between 15 and 24 months.

    Main Methods:

    • Longitudinal analysis of meaningful speech samples from 34 children.
    • Construction of individual consonant inventories for word-initial and word-final positions at 15, 18, 21, and 24 months.
    • Group and individual analyses of place and manner of articulation patterns.

    Main Results:

    • Early consonant inventories (15-24 months) primarily featured voiced anterior stops, nasals, and glides in initial positions.
    • By 24 months, voiceless stops, velars, and some fricatives emerged in initial positions.
    • Final position inventories predominantly included voiceless stops and alveolar consonants, with voiced stops appearing earlier in initial positions and [t], [r] earlier in final positions.

    Conclusions:

    • Speech sound development follows consistent patterns in place and manner of articulation across children.
    • Findings align with existing research on early phonological development and babbling.

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