Experimental Blockage of Phonation by Distorted Sidetone

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Abstract
Eight normal males practiced sustaining the vowel (u) in falsetto at a fundamental frequency of 350 cps and at the lowest sound-pressure level conducive to continuous phonation. One auditory sidetone was played with no appreciable non-linear distortion, the other with 62.5% non-linear distortion. Phonatory blockage occurred significantly more often when the air conduction sidetone signal was distorted, and a greater total time was consumed by the phonatory blockages. Sound specto-graphic analysis revealed that essentially the same pattern existed when phonation was blocked by voluntarily approximating the vocal cords. Three effects were observed: blockage of phonation, extreme pitch variability, and voice quality of an undesirable nature.
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