Document Detail

Observation and analysis of in vivo vocal fold tissue instabilities produced by nonlinear source-filter coupling: a case study.
MedLine Citation:
PMID:  21303014     Owner:  NLM     Status:  MEDLINE    
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.
Matías Zañartu; Daryush D Mehta; Julio C Ho; George R Wodicka; Robert E Hillman
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Publication Detail:
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:
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:
Created Date:  2011-02-09     Completed Date:  2011-05-27     Revised Date:  2014-03-20    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  326-39     Citation Subset:  IM    
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MeSH Terms
Biomechanical Phenomena
Larynx / anatomy & histology,  physiology*
Models, Biological
Nonlinear Dynamics
Sound Spectrography
Speech Acoustics*
Time Factors
Video Recording
Vocal Cords / anatomy & histology,  physiology*
Voice Quality*
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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