Abstract
Changes in time of frequencies and formant levels were measured in disturbed phoneme articulation. Ten stutterers read the same text in two situations: with simultaneous auditory feedback (SAF) and delayed auditory feedback (DAF). Words chosen for the analyses were ones uttered nonfluently with SAF and fluently with DAF. Frequency characteristics of the phonemes uttered nonfluently and realized fluently were made using computer procedures. These characteristics were analyzed in time intervals of 10 ms. Time evolutions of frequencies and formant levels were made in the cases of fluent and nonfluent articulation of the same phonemes. Results for the stutterers were compared with the ones for fluent speakers in identical utterances. The analysis of time evolution of formant allowed for a description of the vocal tract dynamics in the moments of stuttering. Studying the behavior of these formants in the conditions of forced fluency, that is, with DAF, afforded for anticipating the possible changes in the dynamics of the vocal tract leading to proper pronunciation. The significance of the measures of the parameters was shown for diagnosing and treatment of stuttering.
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