Two aerodynamic and three acoustic measures were related to stressed versus unstressed words of American English. Six speakers were required to repeat sentences while systematically varying stress. A group of listeners verified the place of stress intended by the speakers. Intraoral air pressure, air flow, vocal intensity, fundamental frequency, and duration were measured. Of these parameters, fundamental frequency was most significantly related to stress variations, suggesting that stress may be a laryngeal function. Moreover, a trading relationship between frequency and duration for terminal stressed words was noted.

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