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. 2017 Dec 20;60(12):3404-3416.
doi: 10.1044/2017_JSLHR-S-17-0180.

Magnitude of Neck-Surface Vibration as an Estimate of Subglottal Pressure During Modulations of Vocal Effort and Intensity in Healthy Speakers

Victoria S McKenna  1 , Andres F Llico  1 , Daryush D Mehta  2   3   4 , Joseph S Perkell  1 , Cara E Stepp  1   5   6
Affiliations

Magnitude of Neck-Surface Vibration as an Estimate of Subglottal Pressure During Modulations of Vocal Effort and Intensity in Healthy Speakers

Victoria S McKenna et al. J Speech Lang Hear Res. .

Abstract

Purpose: This study examined the relationship between the magnitude of neck-surface vibration (NSVMag; transduced with an accelerometer) and intraoral estimates of subglottal pressure (P'sg) during variations in vocal effort at 3 intensity levels.

Method: Twelve vocally healthy adults produced strings of /pɑ/ syllables in 3 vocal intensity conditions, while increasing vocal effort during each condition. Measures were made of P'sg (estimated during stop-consonant closure), NSVMag (measured during the following vowel), sound pressure level, and respiratory kinematics. Mixed linear regression was used to analyze the relationship between NSVMag and P'sg with respect to total lung volume excursion, levels of lung volume initiation and termination, airflow, laryngeal resistance, and vocal efficiency across intensity conditions.

Results: NSVMag was significantly related to P'sg (p < .001), and there was a significant, although small, interaction between NSVMag and intensity condition. Total lung excursion was the only additional variable contributing to predicting the NSVMag-P'sg relationship.

Conclusions: NSVMag closely reflects P'sg during variations of vocal effort; however, the relationship changes across different intensities in some individuals. Future research should explore additional NSV-based measures (e.g., glottal airflow features) to improve estimation accuracy during voice production.

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Figures

Figure 1.
Figure 1.
An example of the time-aligned signals for a single set of /pɑ/ syllables produced by Participant 4.
Figure 2.
Figure 2.
Average P′sg and NSVMag for each set of /pɑ/ syllables plotted per participant. The loudness conditions (comfortable, loud, and soft) are produced with varied vocal effort, whereas baseline productions are produced without any additional vocal effort. Individual regression lines are placed for the conditions that included vocal effort. P′sg = subglottal pressure estimate; NSVMag = magnitude of neck-surface vibration.
Figure 3.
Figure 3.
Boxplot of airflow and total lung excursion for each vocal condition.
See this image and copyright information in PMC

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