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Contextual effects in infant speech perception

P D Eimas, J L Miller

    Science (New York, N.Y.)
    |September 5, 1980
    PubMed
    Summary
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    Infants aged 2-4 months can distinguish speech sounds based on formant transition duration. This ability is influenced by context, suggesting relational and categorical speech perception in early development.

    Area of Science:

    • Developmental Psychology
    • Speech Perception
    • Linguistics

    Background:

    • Infants possess remarkable abilities to perceive speech sounds.
    • Understanding the acoustic cues infants use for phonetic discrimination is crucial.

    Purpose of the Study:

    • To investigate whether 2- to 4-month-old infants can discriminate synthetic speech based on formant transition duration.
    • To explore contextual effects on infants' phonetic discrimination abilities.

    Main Methods:

    • Infants were presented with synthetic speech stimuli varying in formant transition duration.
    • Stimuli were designed to signal phonetic distinctions between stop consonants and semivowels.
    • Discriminability was assessed across different stimulus values and syllable durations.

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    Main Results:

    • Infants discriminated speech patterns varying in formant transition duration.
    • The ability to discriminate was context-dependent, influenced by stimulus values and total syllable duration.
    • Contextual effects persisted even when duration information followed transition information.

    Conclusions:

    • Infants utilize formant transition duration to distinguish phonetic categories.
    • Speech perception in infants is relational and categorical, considering contextual acoustic information.
    • Early phonetic perception is sophisticated and sensitive to complex acoustic cues.