Effects of Experimental Palatal Fistulas On Speech And Resonance
Effects of Experimental Palatal Fistulas On Speech And Resonance
Richtner, Ulla E.M.
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One normal speaking subject was fitted with a palatal prosthesis in which controlled openings at the position of the velopharyngeal port could be manipulated. The result showed that when velopharyngeal 9 2 • ■ openings of 7 mm and 50 mm were present vowel intensity 2 was reduced, especially at the 50 mm aperture. It was stated earlier that loudness reduction is fre- quently observed in subjects with VPI. It is, however, uncertain whether this is a result of the intensity reduc- tion or if it is... caused by a behavior to try and hide a speech disorder (Morris, 1968). With Bernthal and Beukelman' s results at hand, it appears that there may exist a close relationship between intensity and loudness in this population. To compensate for this loss of sound energy, speakers with VPI often increase their vocal -56- effort, which might abuse their vocal folds (Bernthal & Beukelraan, 1977) . It is well known that presentation of loud noise alters auditory feedback and causes changes in speech.
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