Videokymography in Voice Disorders: What to Look For?

Švec, Jan G.; Sram, F; Schutte, Harm K.

doi:10.1177/000348940711600303

Cited by 137 publications

(94 citation statements)

References 38 publications

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“…10(B)]. This strong relationship corroborates previous results from a group of 52 normal speakers, in which changes in PA accounted for 74% of the variance in AS , and from qualitative links between these two measures in voice patients ( Svec et al, 2007). Although the model sustains periodic oscillations with PA magnitudes up to 30%, some human subjects exhibit levels of PA over 50% (Fig.…”

Section: A Characteristics Of the Mathematical Modelsupporting

confidence: 88%

“…The axis shift AS is the mediolateral distance traveled by the vocal folds during glottal closure ( Svec et al, 2007):…”

Section: Measures Of Vocal Fold Vibratory Asymmetrymentioning

confidence: 99%

“…In a classification of high-speed videokymography recordings from 45 voice patients, different types of vibratory asymmetry were described qualitatively from the lateral displacement patterns exhibited by the left and right vocal folds ( Svec et al, 2007). Categories of vocal fold vibratory asymmetry included left-right amplitude asymmetry, left-right phase asymmetry, left-right frequency differences, and axis shift during glottal closure.…”

Section: Introductionmentioning

confidence: 99%

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Investigating acoustic correlates of human vocal fold vibratory phase asymmetry through modeling and laryngeal high-speed videoendoscopy

Mehta

Zañartu

Quatieri

et al. 2011

The Journal of the Acoustical Society of America

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Vocal fold vibratory asymmetry is often associated with inefficient sound production through its impact on source spectral tilt. This association is investigated in both a computational voice production model and a group of 47 human subjects. The model provides indirect control over the degree of left-right phase asymmetry within a nonlinear source-filter framework, and high-speed videoendoscopy provides in vivo measures of vocal fold vibratory asymmetry. Source spectral tilt measures are estimated from the inverse-filtered spectrum of the simulated and recorded radiated acoustic pressure. As expected, model simulations indicate that increasing left-right phase asymmetry induces steeper spectral tilt. Subject data, however, reveal that none of the vibratory asymmetry measures correlates with spectral tilt measures. Probing further into physiological correlates of spectral tilt that might be affected by asymmetry, the glottal area waveform is parameterized to obtain measures of the open phase (open=plateau quotient) and closing phase (speed=closing quotient). Subjects' left-right phase asymmetry exhibits low, but statistically significant, correlations with speed quotient (r ¼ 0.45) and closing quotient (r ¼ À0.39). Results call for future studies into the effect of asymmetric vocal fold vibration on glottal airflow and the associated impact on voice source spectral properties and vocal efficiency.

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Section: A Characteristics Of the Mathematical Modelsupporting

confidence: 88%

“…The axis shift AS is the mediolateral distance traveled by the vocal folds during glottal closure ( Svec et al, 2007):…”

Section: Measures Of Vocal Fold Vibratory Asymmetrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigating acoustic correlates of human vocal fold vibratory phase asymmetry through modeling and laryngeal high-speed videoendoscopy

Mehta

Zañartu

Quatieri

et al. 2011

The Journal of the Acoustical Society of America

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“…Digital kymography allows, amongst others, observation of the following features of laryngeal tissue vibration with high temporal resolution: (a) vertical phase differences between the lower (inferior) and the upper (superior) margins of the vocal folds (Baer, 1981;Titze et al, 1993b) -see supplementary material Fig.S2 for a schematic illustration; (b) mucosal waves (Hirano et al, 1981;Berke and Gerratt, 1993), i.e. air flow-driven travelling waves within the surface of the vocal fold tissue, moving along the trans-glottal air flow from the inferior to the superior vocal fold edge and then laterally across the upper vocal fold surface once every oscillatory cycle; and (c) vibratory asymmetries and different types of irregularities and cycle aberrations (Svec et al, 2007).…”

Section: High-speed Video Data Analysismentioning

confidence: 99%

Complex vibratory patterns in an elephant larynx

Švec

Lohscheller

et al. 2013

Journal of Experimental Biology

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SUMMARYElephants' low-frequency vocalizations are produced by flow-induced self-sustaining oscillations of laryngeal tissue. To date, little is known in detail about the vibratory phenomena in the elephant larynx. Here, we provide a first descriptive report of the complex oscillatory features found in the excised larynx of a 25year old female African elephant (Loxodonta africana), the largest animal sound generator ever studied experimentally. Sound production was documented with high-speed video, acoustic measurements, air flow and sound pressure level recordings. The anatomy of the larynx was studied with computed tomography (CT) and dissections. Elephant CT vocal anatomy data were further compared with the anatomy of an adult human male. We observed numerous unusual phenomena, not typically reported in human vocal fold vibrations. Phase delays along both the inferior-superior and anterior-posterior (A-P) dimension were commonly observed, as well as transverse travelling wave patterns along the A-P dimension, previously not documented in the literature. Acoustic energy was mainly created during the instant of glottal opening. The vestibular folds, when adducted, participated in tissue vibration, effectively increasing the generated sound pressure level by 12dB. The complexity of the observed phenomena is partly attributed to the distinct laryngeal anatomy of the elephant larynx, which is not simply a large-scale version of its human counterpart. Travelling waves may be facilitated by low fundamental frequencies and increased vocal fold tension. A travelling wave model is proposed, to account for three types of phenomena: A-P travelling waves, 'conventional' standing wave patterns, and irregular vocal fold vibration. Supplementary material available online at

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“…Addition of the third mass divides the upper part of the cover layer into two portions, which can vibrate out of phase. These phase differences can simulate the mucosal waves, which are observed in the videokymograms of both chest and falsetto registers [129,131,132]. In particular, during the falsetto register, the waves are visible only on the thin upper medial portion of the vocal folds and on the upper vocal fold surface.…”

Section: Modelling Register Transitionsmentioning

confidence: 94%

Analysing and Understanding the Singing Voice: Recent Progress and Open Questions

Kob¹,

Henrich²,

Herzel³

et al. 2011

CBIO

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Abstract:The breadth of expression in singing depends on fine control of physiology and acoustics. In this review, the basic concepts from speech acoustics, including the source-filter model, models of the glottal source and source-filter interactions, are described. The precise control, the extended pitch range, the timbre control and, in some cases, the uses of alternate phonation modes all merit further attention and explanation. Here we review features of the singing voice and the understanding that has been delivered by new measurement techniques. We describe the glottal mechanisms and the control of vocal tract resonances used in singing. We review linear and nonlinear components of the voice and the way in which they are measured and modelled and discuss the aero-acoustic models. We conclude with a list of open questions and active fields of research.

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Videokymography in Voice Disorders: What to Look For?

Abstract: The variations in the identified features reveal different behavioral origins of voice disorders. The findings open new possibilities for objective documentation and for monitoring vocal fold behavior in clinical practice through kymographic imaging.

Cited by 137 publications

References 38 publications

Investigating acoustic correlates of human vocal fold vibratory phase asymmetry through modeling and laryngeal high-speed videoendoscopy

Investigating acoustic correlates of human vocal fold vibratory phase asymmetry through modeling and laryngeal high-speed videoendoscopy

Complex vibratory patterns in an elephant larynx

Analysing and Understanding the Singing Voice: Recent Progress and Open Questions

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