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Temporal patterns of coarticulation: lip rounding

F Bell-Berti, K S Harris

    The Journal of the Acoustical Society of America
    |February 1, 1982
    PubMed
    Summary
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    This study challenges the "articulatory sluggishness" theory of carryover coarticulation. Electromyography (EMG) data show vowel lip rounding gestures co-occur predictably with lingual consonants, not due to sluggishness.

    Area of Science:

    • Phonetics
    • Speech Production
    • Linguistics

    Background:

    • Coarticulation theories explain speech sound assimilation.
    • Anticipatory coarticulation involves feature migration to preceding sounds.
    • Carryover coarticulation is often attributed to articulatory sluggishness.

    Purpose of the Study:

    • To investigate the mechanisms of carryover coarticulation.
    • To test the "articulatory sluggishness" hypothesis for vowel lip rounding.
    • To provide electromyographic (EMG) evidence on speech gesture timing.

    Main Methods:

    • Electromyography (EMG) was used to measure muscle activity during speech.
    • The timing of EMG activity for vowel lip rounding was analyzed.
    • Acoustic durations of adjacent lingual consonants were measured.

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    Main Results:

    • The onset of EMG activity for vowel lip rounding was independent of lingual consonant acoustic duration.
    • This finding contradicts the "articulatory sluggishness" explanation.
    • Vowel rounding gestures appear to co-occur with lingual consonant articulations predictably.

    Conclusions:

    • The traditional "articulatory sluggishness" model is inadequate for explaining carryover coarticulation.
    • Vowel rounding gestures are timed to co-occur with lingual consonants.
    • Speech production involves predictable temporal coordination of articulatory gestures.