| Observation and analysis of in vivo vocal fold tissue instabilities produced by nonlinear source-filter coupling: a case study. | |
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MedLine Citation:
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PMID: 21303014 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Different source-related factors can lead to vocal fold instabilities and bifurcations referred to as voice breaks. Nonlinear coupling in phonation suggests that changes in acoustic loading can also be responsible for this unstable behavior. However, no in vivo visualization of tissue motion during these acoustically induced instabilities has been reported. Simultaneous recordings of laryngeal high-speed videoendoscopy, acoustics, aerodynamics, electroglottography, and neck skin acceleration are obtained from a participant consistently exhibiting voice breaks during pitch glide maneuvers. Results suggest that acoustically induced and source-induced instabilities can be distinguished at the tissue level. Differences in vibratory patterns are described through kymography and phonovibrography; measures of glottal area, open/speed quotient, and amplitude/phase asymmetry; and empirical orthogonal function decomposition. Acoustically induced tissue instabilities appear abruptly and exhibit irregular vocal fold motion after the bifurcation point, whereas source-induced ones show a smoother transition. These observations are also reflected in the acoustic and acceleration signals. Added aperiodicity is observed after the acoustically induced break, and harmonic changes appear prior to the bifurcation for the source-induced break. Both types of breaks appear to be subcritical bifurcations due to the presence of hysteresis and amplitude changes after the frequency jumps. These results are consistent with previous studies and the nonlinear source-filter coupling theory. |
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Authors:
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Matías Zañartu; Daryush D Mehta; Julio C Ho; George R Wodicka; Robert E Hillman |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 129 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-02-09 Completed Date: 2011-05-27 Revised Date: 2012-01-02 |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 326-39 Citation Subset: IM |
Affiliation:
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School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA. mzanartu@purdue.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Biomechanics Electromyography Humans Laryngoscopy Larynx / anatomy & histology, physiology* Male Models, Biological Nonlinear Dynamics Phonation* Sound Spectrography Speech Acoustics* Time Factors Vibration Video Recording Vocal Cords / anatomy & histology, physiology* Voice Quality* |
| Grant Support | |
ID/Acronym/Agency:
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R01 DC007640/DC/NIDCD NIH HHS; T32 DC00038/DC/NIDCD NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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