Effects of transglottal pressure change on fundamental frequency of phonation: preliminary evaluation of the effect of intraoral pressure change.

The effect of transglottal pressure on the fundamental frequency of phonation was investigated in 14 subjects (12 adults and 2 children). A sudden change in intra-oral pressure was produced during sustained phonation. The effects of this pressure change were not monotonic, even within the modal register (around the upper end of the speaking range). The physical properties of the vocal folds related to the cricothyroid and thyroarytenoid muscles seemed to be important.