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- Granqvist, Svante, et al.
(författare)
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Resonance tube phonation in water : High-speed imaging, electroglottographic and oral pressure observations of vocal fold vibrations - A pilot study
- 2015
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Ingår i: Logopedics, Phoniatrics, Vocology. - : Taylor & Francis. - 1401-5439 .- 1651-2022. ; 40:3, s. 113-121
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Tidskriftsartikel (refereegranskat)abstract
- Phonation into glass tubes (resonance tubes), keeping the free end of the tube in water, has been a frequently used voice therapy method in Finland and more recently also in other countries. The purpose of this exploratory study was to investigate what effects tube phonation with and without water has on the larynx. Two participants were included in the study. The methods used were high-speed imaging, electroglottographic observations of vocal fold vibrations, and measurements of oral pressure during tube phonation. Results showed that the fluctuation in the back pressure during tube phonation in water altered the vocal fold vibrations. In the high-speed imaging, effects were found in the open quotient and amplitude variation of the glottal opening. The open quotient increased with increasing water depth (from 2 cm to 6 cm). A modulation effect by the water bubbles on the vocal fold vibrations was seen both in the high-speed glottal area tracings and in the electroglottography signal. A second experiment revealed that the increased average oral pressure was largely determined by the water depth. The increased open quotient can possibly be explained by an increased abduction of the vocal folds and/or a reduced transglottal pressure. The back pressure of the bubbles also modulates glottal vibrations with a possible massage effect on the vocal folds. This effect and the well-defined average pressure increase due to the known water depth are different from those of other methods using a semi-occluded vocal tract.
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| 6. |
- Hertegård, S., et al.
(författare)
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Botulinum toxin injections for essential voice tremor
- 2000
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Ingår i: Annals of Otology, Rhinology and Laryngology. - : SAGE Publications. - 0003-4894 .- 1943-572X. ; 109:2, s. 204-209
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Tidskriftsartikel (refereegranskat)abstract
- Fifteen patients, 13 women and 2 men, with a mean age of 72.7 years (56 to 86 years) and a clinical diagnosis of essential voice tremor, were treated with botulinum injections to the thyroarytenoid muscles, and in some cases, to the cricothyroid or thyrohyoid muscles. Evaluations were based on subjective judgments by die patients, and on perceptual and acoustic analysis of voice recordings. Subjective evaluations indicated that the treatment had a beneficial effect in 678 of the patients. Perceptual evaluations showed a significant decrease in voice tremor during connected speech (p < .05). Acoustic analysis showed a nearly significant decrease in the fundamental frequency variations (p = .06) and a significant decrease in fundamental frequency during sustained vowel phonation (p <. 01). The results of perceptual evaluation coincided most closely with the subjective judgments. It was concluded that the treatment was successful in 50% to 65% of the patients, depending on the method of evaluation.
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| 7. |
- Hertegård, Stellan, et al.
(författare)
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Elasticity measurements in scarred rabbit vocal folds using air pulse stimulation.
- 2009
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Ingår i: Logopedics, phoniatrics, vocology. - : Informa UK Limited. - 1651-2022 .- 1401-5439. ; 34:4, s. 190-5
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Tidskriftsartikel (refereegranskat)abstract
- This study aimed to compare vocal fold elasticity data from a new method for non-invasive analysis by stimulations of the mucosa with short air pulses. The depth of the mucosal deflections is measured with laser pulses by means of a special algorithm. Ten scarred New Zealand rabbit vocal folds and four normal rabbit folds were measured directly after sacrifice. The elastic data were compared to histological sections from the scarred vocal folds analysed by a pathologist. The results showed significantly lower elasticity (higher stiffness) values for the more scarred vocal folds as compared to samples with minor damage (P=0.03). It is concluded that the air pulse stimulation method is a promising tool for non-invasive quantification of vocal fold scarring.
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| 14. |
- Pulakka, H., et al.
(författare)
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Analysis of the voice source in different phonation types : Simultaneous high-speed imaging of the vocal fold vibration and glottal inverse filtering
- 2004
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Ingår i: 8th International Conference on Spoken Language Processing, ICSLP 2004. - : International Speech Communication Association. ; , s. 1121-1124
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Konferensbidrag (refereegranskat)abstract
- Glottal flow waveforms estimated by inverse filtering acoustic speech pressure signals were compared to glottal area functions obtained by digital high-speed imaging of the vocal fold vibration. Speech data consisted of breathy, normal and pressed phonations produced by two male and one female subjects. The results yield both qualitative and quantitative information about the relationship between the glottal flow and the corresponding area function. It was shown, for example, that a distinct knee in the glottal flow waveform in the opening phase corresponds to the abrupt opening of the vocal folds in normal and pressed phonation. In addition, the obtained quantitative data corroborates known theoretical considerations according to which the shape of the glottal flow is more asymmetric than the corresponding area function.
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