Abstract
This study examined the effects of stress level on jaw movement. Jaw displacement was measured by a strain gauge transducer during the production of normal, whispered and fast repetitions of five nonsense syllable phrases. Jaw velocity was extracted by an analog differentiator. Jaw velocity was compared to the perceived levels of stress of the nonsense syllables at the two rates of speech and while whispering. Jaw velocity was found to be significantly related to stress level. Three levels of stress—unstressed, stressed, and prominently stressed or beat syllables—were distinguished on the basis of differences in opening vowel velocity. [Work supported by NIH Grant DE-03631.]
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