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The Predictability of Formant Patterns Based on Lingual Kinematics
Antje Mefferd and Jordan Green

Although kinematic and acoustic changes in response to speaking rate and loudness manipulation have been consistently demonstrated, the degree of their association is not well understood. This study investigated the articulatory-to-acoustic relationship in response to speaking rate and loudness manipulation to answer the question whether acoustic target precision and formant pattern stability during the production of diphthongs can be predicted from lingual precision and movement pattern stability. Ten typical speakers produced one sentence in typical, fast, slow, and loud speech. Tongue movements were captured using 3-D electromagnetic articulography. The relationship between articulatory and acoustic target precision was determined by comparing the changes in lingual excursion extrema during the production of “ia” and “oi” with the Euclidean distance changes in vowel space across speaking tasks. The relationship of movement pattern and formant pattern stability was determined by comparing sliding window correlations of lingual velocity signals and F2 velocity signals across speaking tasks. Results will provide information about the trading relations between articulatory and acoustic target precision and movement pattern stability, which in the future, may be useful for improving the effectiveness of treatments designed to improve speech intelligibility.

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