The consistency of the pressure-flow technique for assessing oral port size

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Abstract
The consistency of the technique for estimating oral constriction size was studied under a variety of conditions including varying the subjects’ preparation for a task, varying the testing procedure, and changing phonetic context. Results indicate that both the mean and variance of oral port openings for the phonemes /s/, /f/, /v/, and /z/ differ among subjects but are fairly consistent within individuals. The consonants differed in terms of mean oral port size according to phonetic type, with /s/≳/f/≳/z/≳/v/: voiceless sounds demonstrated larger openings than voiced sounds, and alveolars larger than labiodentals. Oral port openings were also smaller in continuous speech than in isolated sounds. Changing the subjects’ preparation for the task of varying the procedures affected neither the average size of the opening nor its variability.

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