The effects of feedback filtering on nasality perception were investigated by having speakers produce sentences while hearing their voices unfiltered and low-pass filtered with cut-off frequencies of 1000, 500, and 300 Hz. As they spoke, speakers judged the nasality in their productions using a ratio scale. Measurements of nasalization were made with a miniature accelerometer attached to the side of the speaker's nose. Data obtained indicate that the speakers decreased their nasalization slightly when they heard their voices low-pass filtered at each cut-off frequency. However, they did not perceive consistent changes in their own nasality during the filtered conditions. These findings are interpreted as suggesting that nasalization is influenced by filtering air-conducted auditory information and that relationships between the acoustic correlates of nasalization and self-perception of nasality are complex.
The relationship between speaker and listener perception of nasality was investigated by having speakers judge their own productions as they vocalized. The productions were taped and played to listeners who judged the speaker's nasality. In part one, speakers used a magnitude production procedure and both speakers and listeners rated nasality, using a ratio scale. Output from an accelerometer placed on the speaker's nose provided a measure of nasalization. Self-perception grew approximately as the 4.4 power of nasalization. Listener perception grew as the 2.2 power of nasalization. Thus, self-perception of nasality grew twice as rapidly as listener perception for a given increase in nasalization. In part two, both listeners and speakers used a magnitude-estimation procedure. The exponents for the power functions for self and listener perception were 3.6 and 1.7, respectively. The 2 to 1 relationship between self and listener perception of nasality held when different procedures were used. The 2 to 1 ratio closely paralleled data on vocal loudness. [H. L. Lane, A. C. Catania, and S.S. Stevens, J. Acoust. Soc. Am. 33, 160–167 (1961)].
The purpose of the present study is to compare jaw movement patterns during speech in persons with varying occlusion and to describe the changes in patterns which occur following surgical repositioning of the jaws (orthognathic surgery). Subjects are placed in a cephalostat and tape recorded using a videofluoroscopic procedure. Selected portions of the tapes are photographed with a 35-mm camera and enlarged to life size. Cephalometric measurements of lip, tongue and jaw position are made from each photograph. At present, data on sustained phonation of /s/ and /∫/ have been obtained from persons with varying occlusion. In addition, two subjects have been tested before and after orthognathic surgery. Preliminary data indicate that speakers tend to compensate for their malocclusion. Persons with excessive overjet move their mandibles forward and persons with deep overbite rotate their mandibles open during speech. Following surgery, these patterns are altered. [Work supported by a University of Minnesota Graduate School Grant and an NIDR fellowship.]
sound spectrographic analysis. Subjects produced/a/in natural speaking voice. EGG signals were recorded by means of a Fourtin laryngograph. Fifth consecutive cycles of EGG waves during steady phonation were used for analysis. Three experts in voice pathology rated the degree of hoarseness of each voice sample. The results showed close relation between perturbation analysis of EGG waves and degree of hoarseness evaluated perceptually and by sound spectrographic analysis. There was some overlap between normal and pathological groups. It was found that amplitude perturbation was a more sensitive measure of the irregularity of vocal-fold vibration than pitch perturbation. Usefulness and limitation of this method are discussed. [Work partly supported by NIH Grant NS-13870.] 9:05 BB5. Invariance of transitional movements under changes in lexical
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