Abstract

Mean intraglottal pressure is discussed in relation to subglottal pressure, supraglottal pressure and transglottal pressure. In the opening phase, mean intraglottal pressure (the net vocal fold driving pressure) is strongly dependent on transglottal pressure, but in the closing phase it depends almost entirely on supraglottal pressure. Negative mean intraglottal pressure occurs briefly in the glottal cycle, but is not essential for oscillation. The Bernoulli principle is re-examined.

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