Abstract
EMG recordings from several muscles controlling tongue body movement for various VCV and VCCV utterances were examined to uncover the factors influencing the extent and direction of the coarticulatory reorganization of motor commands for speech gestures, and to reveal physiological correlates of syllable boundaries. The primary determiner of the direction of the reorganization appears to be the individual muscle's function in increasing or decreasing vocal tract constriction (closure and release). Muscles producing greater constrictions show anticipatory coarticulation while those producing greater openings show postcipatory coarticulation. Since consonants are produced with greater vocal tract constriction than are vowels, they limit the extent and direction of coarticulation. Thus, reorganization at the motor command level is shown for both anticipatory and postcipatory coarticulation. Syllabic units appear as VC sequences for muscles constricting the vocal tract and CV sequences for muscles expanding the vocal tract. [Supported by NIDR Grant DE01774.]
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