Vocal Fold Collision Speed in vivo: The Effect of Loudness

Dejonckere, Philippe H.; Lebacq, Jean

doi:10.1016/j.jvoice.2020.08.025

Cited by 9 publications

(4 citation statements)

References 28 publications

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“…Speaking with increased voice SPL is a risk factor for impairing voice quality due to an increase in vocal fold collision stress, which strongly depends on the vocal fold velocity at the time of impact [ 65 ]. Additionally vocal fold impact stress correlates positively with subglottic pressure which in turn is also closely related to vocal intensity.…”

Section: Discussionmentioning

confidence: 99%

Vocal Behavior of Teachers Reading with Raised Voice in a Noisy Environment

Nusseck

Immerz

Richter

et al. 2022

IJERPH

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(1) Objective: Teaching is a particularly voice-demanding occupation. Voice training provided during teachers’ education is often insufficient and thus teachers are at risk of developing voice disorders. Vocal demands during teaching are not only characterized by speaking for long durations but also by speaking in noisy environments. This provokes the so-called Lombard effect, which intuitively leads to an increase in voice intensity, pitch and phonation time in laboratory studies. However, this effect has not been thoroughly investigated in realistic teaching scenarios. (2) Methods: This study thus examined how 13 experienced, but vocally untrained, teachers behaved when reading in a noisy compared to quiet background environment. The quiet and noisy conditions were provided by a live audience either listening quietly or making noise by talking to each other. By using a portable voice accumulator, the fundamental frequency, sound pressure level of the voice and the noise as well as the phonation time were recorded in both conditions. (3) Results: The results showed that the teachers mainly responded according to the Lombard effect. In addition, analysis of phonation time revealed that they failed to increase inhalation time and appeared to lose articulation through the shortening of voiceless consonants in the noisy condition. (4) Conclusion: The teachers demonstrated vocally demanding behavior when speaking in the noisy condition, which can lead to vocal fatigue and cause dysphonia. The findings underline the necessity for specific voice training in teachers’ education, and the content of such training is discussed in light of the results.

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Section: Discussionmentioning

confidence: 99%

Vocal Behavior of Teachers Reading with Raised Voice in a Noisy Environment

Nusseck

Immerz

Richter

et al. 2022

IJERPH

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“…In contrast to the length (which is stable in modal phonation), the maximum glottal width is strongly correlated (male subjects, modal register) with the intensity of the vocal emission [41,42].…”

Section: Glottal Area Calculationmentioning

confidence: 90%

The Physics of the Human Vocal Folds as a Biological Oscillator

Henri DeJonckere,

Lebacq

2024

New Insights on Oscillators and Their Applications to Engineering and Science

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The human voice results from the vibration of air at the vocal folds (VF), which behave as a damped oscillator controlled by intraglottic pressure and tranglottic airflow. This chapter presents a complete synthesis of the physics of vocal dynamics (1) during a sustained oscillation, particularly with regard to the phase relationship between intraglottic pressure and glottal opening and closing; (2) during the onset of the oscillation, particularly with regard to the mechanism explaining the triggering of the initiation of the oscillation; and (3) during the decay of the damped oscillations during voice offset, particularly with regard to the effect of lung volume. The importance of air volume as an essential component of the vibratory system is highlighted. The experimental data are obtained in vivo by simultaneous measurement of the transglottic flow and the glottic surface, which allows the calculation of the intraglottic pressure and its interaction with the inertia of the vocal tract.

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“…Contrary to the length, the maximal glottal width is strongly correlated (male subjects, breast register) with the intensity of voicing [6,42] as shown in (Figure 16). The maximum glottal area is directly computed from the photometric signal, after calibration based on imaging, with a precision of 5%-10%.…”

Section: Figure 15mentioning

confidence: 96%

Experimenting ‘In Vivo’ with Dynamic Glottal Parameters: Methodological Issues, Technical Tips & Tricks and Preventable Pitfalls

DeJonckere,

Lebacq,

DeJonckere

2023

PNEURO

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‘In vivo’ studies pertaining to dynamics of vocal fold vibration motion, to vocal fold contact and collision, to vocal onset and offset and to mechanical efficiency all need valid, sensitive and precise measurements of the different mechanical parameters involved. This is also true for investigating the physiological correlates of particular acoustic events like register breaks or diplophonia. The main physical parameters involved are: vocal fold movement and shaping, particularly the velocity of tissue displacement, glottal area, tissue distortion, intraglottal pressure, transglottal air flow, vocal fold contact and collision stress, etc. This article presents a critical review of the instruments and techniques involved in the direct measurements of the glottal dimensions and movements, the transglottal airflow, the VF contact changes, the pressures and the sound acoustic pressure. In each case are analyzed the methodological aspects that are critical for validly calibrating and synchronizing these signals, and correcting them for time delays. Moreover, it is shown how new parameters, like vocal fold velocity, intraglottal pressure, vocal fold collision stress, can be inferred from these (raw or after differentiation) signals by combining them. Finally, the discussion focuses on weighing advantages and limitations of techniques for monitoring the glottal area, i.e. photometry and the high-speed imaging, the latter involving the relevance in this scope of future developments in endoscopic and external imaging techniques, and in image processing software. Our aim is to facilitate the work of future researchers by showing how to solve important technical pitfalls, how to apply the necessary corrective measures - and which ones - where needed, and how to get the most out of combinatorial measures.

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Vocal Fold Collision Speed in vivo: The Effect of Loudness

Cited by 9 publications

References 28 publications

Vocal Behavior of Teachers Reading with Raised Voice in a Noisy Environment

Vocal Behavior of Teachers Reading with Raised Voice in a Noisy Environment

The Physics of the Human Vocal Folds as a Biological Oscillator

Experimenting ‘In Vivo’ with Dynamic Glottal Parameters: Methodological Issues, Technical Tips & Tricks and Preventable Pitfalls

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