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Phonetic development in identical twins differing in auditory function.

R D Kent, M J Osberger, R Netsell

    The Journal of Speech and Hearing Disorders
    |February 1, 1987
    PubMed
    Summary
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    Identical twins, one with normal hearing and one with profound hearing loss, showed distinct vocal development. Differences in babbling emerged early, highlighting the impact of auditory function on infant speech development.

    Area of Science:

    • Developmental Psychology
    • Speech-Language Pathology
    • Genetics

    Background:

    • Identical twins provide a unique model for studying genetic vs. environmental influences.
    • Auditory input is crucial for typical vocal and speech development in infants.

    Purpose of the Study:

    • To investigate the impact of profound hearing loss on vocal development in an infant.
    • To compare vocal production in a hearing infant and his identical twin with bilateral hearing loss.

    Main Methods:

    • Longitudinal acoustic-phonetic analysis of vocalizations.
    • Comparison of babbling in monozygotic twins with differing auditory functions at 8, 12, and 15 months.
    • Analysis of formant patterns, consonant occurrences, syllable structures, and vowel usage.

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    Main Results:

    • Acoustic-phonetic differences in babbling were observed as early as 8 months.
    • Differences in vocalic elements, consonant production (fricatives, affricates, trills), syllable types, and vowel variation increased over time.
    • The hearing infant exhibited more typical vocal development patterns compared to his hearing-impaired twin.

    Conclusions:

    • Early identification of infants at risk for communication disorders is critical.
    • Auditory input significantly influences the development of phonetic skills in infancy.
    • Findings support the role of auditory-motor integration in speech acquisition.