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Articulatory movement and normal aging: Acoustic and kinematic data
Kaye Strom, Frank Boutsen, Kathleen Thompson

Although recent literature reports deterioration of the human voice with aging, little research has addressed deterioration of articulation during normal aging. This study investigated articulation during vowel production when phonetic context (phrases, sentences, and paragraph material) and loudness level requirements (65dB, 75dB, and 85dB) were varied. Participants ranged in age from 20-92 years. Formant measurements were used to estimate lingual excursion (comparing the relative distance of F1and F2 of the four corner vowels from the schwa vowel in each target production.) acoustically while video analysis was employed to gauge the combined contribution of the jaw and lips during articulation. Results suggest that the range of motion of the lingual as well as labial and mandibular movements becomes less distinct during normal aging and deterioration becomes more pronounced with advancing age.

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