Abstract
The change of fundamental frequency (F0) per unit change of transglottal pressure (dF/dP) is determined by the amount of displacement of the vocal folds. Since the amount of displacement varies with the stiffness of the vocal folds, this study was designed to determine whether the stiffness of the vocal folds can be evaluated with dF/dP. In a preliminary study the correlation between F0 and dF/dP was examined in normal subjects; 14 humans and 5 dogs.Method. 1) Transglottal pressure (Pt) changes were produced during sustained phonation in 6 male, and 6 female adults and 2 children. The pressure changes were applied by closing a shutter valve mounted on a mouthpiece. F0 and intraoral pressure were measured. 2) Pt changes were produced in 5 living adult dogs. The pressure changes were applied by closing a shutter valve mounted on a tube for insufflating the larynx. F0 and subglottal pressure were measured.Result. 1) The values of dF/dP, in modal register, decreased linearly and increased linearly as F0 increased in all subjects. The smallest values of dF/dP were observed around 200-250Hz in males and 250-300Hz in females and children. The value of dF/dP was larger in falsetto voice in terms of the same F0 between high pitch modal register and low pitch falsetto. 2) The same pattern of correlation between F0 and dF/dP was also observed in adult dogs. The correlation between F0 and dF/dP in this study indicated a potential usefulness for the evaluation of the stiffness of the vocal folds.
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