Abstract
Recordings of jaw acceleration (Jx/t2) were obtained in an attempt to provide some preliminary information on the nature of the masticatory muscle forcing function during speech. The impetus for this approximation was provided by Newton's second law of motion. Speech audio, intraoral air pressure (Po), jaw displacement (Jx), and jaw velocity (Jx/t) were simultaneously recorded with Jx/t2 to facilitate inferences to net muscle force. The temporal and magnitude characteristics of Jx/t2 appear to have implications for (1) the pattern of net muscle activity in jaw opening and closing, (2) the influence of gravitational acceleration, and (3) general articulatory mechanics.
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