Electroglottography – An Update

Herbst, Christian T.

doi:10.1016/j.jvoice.2018.12.014

Cited by 61 publications

(29 citation statements)

References 229 publications

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“…With heavy registers, such as the modal voice, VFs make wide contact from the lower to the upper part. 6,7 However, lesions were concentrated in the lower part, likely because VFs vibrate with a phase difference between the lower and upper parts, 19 and uneven forces are applied to the free edges during oscillation.…”

Section: Discussionmentioning

confidence: 99%

“…In the typical EGG waveform of the modal voice, the contacting phase (positive slope part of the closed phase) is shorter than the de-contacting phase (negative slope part of the closed phase). 19 Contact and separation of VFs proceed from the lower to the upper part; therefore, if the contacting phase is shorter than the de-contacting phase, the lower edge may have shorter contact time than the upper edge. Temporal transition of the contact surface was reported in the deer hemi-larynx, 25 in which the contacting phase was shorter than the de-contacting phase, and the contact time was apparently shorter in the lower edge than in the upper edge during one VF vibration cycle.…”

Section: Discussionmentioning

confidence: 99%

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Predominant Vertical Location of Benign Vocal Fold Lesions by Sex and Music Genre: Implication for Pathogenesis

et al. 2021

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Objectives/Hypothesis: Vertical locations of vocal fold mucosal lesions (VFMLs) vary along the free edge. As the vertical contact area of vocal folds (VFs) depends on the vocal register, lesions may occur in the contact area of more frequently used vocal registers. This study investigated the cause of location variations by comparing the vertical sites of VFMLs in singers of both sexes with different music genres.Study Design: Retrospective review. Methods: Sixty professional classical and rock singers (11 male classical [M-classical], 22 male rock [M-rock], 13 female classical [F-classical], and 14 female rock [F-rock] singers) who underwent microlaryngeal surgery for VF polyps and nodules and their 108 lesions were enrolled. The VF free edge was vertically divided into three equal parts and classified into the following four lesion sites: upper, middle, lower, and multiple sites.Results: Upper lesions were most common among F-classical singers (73.9%), whereas lower lesions were most common among M-classical (90.0%) and M-rock (60.6%) singers. Among lesions localized to a single site, lower lesions were most common among F-rock singers (37.0%). F-classical singers had significantly more upper lesions than the other groups (P < .001). M-classical singers had significantly more lower lesions than female singers of any genre (P < .001).Conclusion: Upper lesions were most common among F-classical singers who mostly used the head voice. Lower lesions were most common among singers who mainly used the modal voice. This study suggests that sex, the dominant vocal register used for singing, and mechanical stress on VFs influence the vertical site of VFMLs.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Predominant Vertical Location of Benign Vocal Fold Lesions by Sex and Music Genre: Implication for Pathogenesis

et al. 2021

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“…An extensive recent review of the use of the method across various disciplines (voice physiology, singing, swallowing, speech signal processing, phonetics, etc. )—is provided by Herbst (2019). Notably, the author stresses that the full potential of EGG is still to be exploited – something that should be facilitated by the development and validation of novel quantitative and interpretative approaches, as well as advances in the measurement technology itself.…”

Section: Laryngeal Gesturesmentioning

confidence: 99%

Research methods in articulatory phoneticsII: Studying other gestures and recent trends

Kochetov

2020

Language and Linguist. Compass

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This article is Part II of a general overview of current methods in articulatory phonetics research (which also consists of Part I "Research methods in articulatory phonetics I: Introduction & studying oral gestures"). The article begins by examining methods employed by phoneticians to investigate laryngeal and nasal gestures-speech-related configurations of the glottis and the lowering/raising the velum for nasal/oral consonants and vowels. This is done by reviewing the methods of electroglottography, endoscopy, photoglottography, and measurements of airflow and air pressure. The article further examines magnetic resonance imaging and radiography (X-rays)-the methods employed to investigate the entire vocal tract. The review is concluded with the methods of video recording and optical tracking, as used to study manual gestures in speech and sign language. Each methodological section contains a review of relevant journal publications illustrating the application of the method, as well as references to further readings. The article concludes with an overview of current developments and trends in instrumental articulatory phonetics, and highlight issues requiring further research.

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“…The electroglottogram is a plot of variations in the electrical impedance reflecting the changes in the vocal fold contact area (Baken, 1992). A very thorough update on scientific literature on EGG can be found in Herbst (2020). The EGG waveform represents relative vocal fold contact area, from a minimum at its baseline to a maximum at its peak.…”

mentioning

confidence: 99%

“…The key characteristics of a single EGG pulse in adults include the duration of contact relative to the pulse period (the contact quotient), the maximum rate-of-change of contact area (the peak of the derivative of the EGG; or "peak dEGG"), the moment of maximum contact (maximum peak), the skewness of the pulse (asymmetry of the peak), and the so-called "knee" (convexity along the descending slope due to the medial vocal fold bulge and rapid change in contacting/decontacting of the vocal folds), all of which can be identified qualitatively on visual inspection or quantified using various parameters of the EGG wave shape (Herbst, 2020). To the best of our knowledge, empirical investigations quantifying the skewness, the peak dEGG, and the presence or the absence of the "knee" in the EGG wave shape are lacking for the pediatric population.…”

mentioning

confidence: 99%

Quantitative and Qualitative Electroglottographic Wave Shape Differences in Children and Adults Using Voice Map–Based Analysis

Patel

Ternström

2021

J Speech Lang Hear Res

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Purpose The purpose of this study is to identify the extent to which various measurements of contacting parameters differ between children and adults during habitual range and overlap vocal frequency/intensity, using voice map–based assessment of noninvasive electroglottography (EGG). Method EGG voice maps were analyzed from 26 adults (22–45 years) and 22 children (4–8 years) during connected speech and vowel /a/ over the habitual range and the overlap vocal frequency/intensity from the voice range profile task on the vowel /a/. Mean and standard deviations of contact quotient by integration, normalized contacting speed, quotient of speed by integration, and cycle-rate sample entropy were obtained. Group differences were evaluated using the linear mixed model analysis for the habitual range connected speech and the vowel, whereas analysis of covariance was conducted for the overlap vocal frequency/intensity from the voice range profile task. Presence of a “knee” on the EGG wave shape was determined by visual inspection of the presence of convexity along the decontacting slope of the EGG pulse and the presence of the second derivative zero-crossing. Results The contact quotient by integration, normalized contacting speed, quotient of speed by integration, and cycle-rate sample entropy were significantly different in children compared to (a) adult males for habitual range and (b) adult males and adult females for the overlap vocal frequency/intensity. None of the children had a “knee” on the decontacting slope of the EGG slope. Conclusion EGG parameters of contact quotient by integration, normalized contacting speed, quotient of speed by integration, cycle-rate sample entropy, and absence of a “knee” on the decontacting slope characterize the wave shape differences between children and adults, whereas the normalized contacting speed, quotient of speed by integration, cycle-rate sample entropy, and presence of a “knee” on the downward pulse slope characterize the wave shape differences between adult males and adult females. Supplemental Material https://doi.org/10.23641/asha.15057345

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Electroglottography – An Update

Cited by 61 publications

References 229 publications

Predominant Vertical Location of Benign Vocal Fold Lesions by Sex and Music Genre: Implication for Pathogenesis

Predominant Vertical Location of Benign Vocal Fold Lesions by Sex and Music Genre: Implication for Pathogenesis

Research methods in articulatory phoneticsII: Studying other gestures and recent trends

Quantitative and Qualitative Electroglottographic Wave Shape Differences in Children and Adults Using Voice Map–Based Analysis

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