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Investigating the Effects of Vocal Frequency and Intensity on Cepstral Peak Prominence and Laryngeal Motion via Electroglottography in Vocally Healthy Children.

Rita R. Patel,M. Stall,Ryane Hohman,Nicolas Escobar-Velasquez

Published 2025 in Journal of Voice

ABSTRACT

OBJECTIVE To examine the impact of vocal frequency and sound level variations on smoothed cepstral peak prominence (CPPs) and electroglottographic (EGG) patterns in healthy children. METHODS From 22 vocally healthy children (4-8 years), phonation of the vowel /a:/ was obtained over the full voice range profile using simultaneous acoustic and EGG measurements. CPPs was calculated from the acoustic signal. The quotient of contact by integration (Qci), normalized peak derivative amplitude quotient (dEGGmax), and cycle-rate sample entropy were obtained from the EGG signal across 10%, 20%, and 80% of vocal frequency and vocal sound level. Linear mixed models were used to test for differences between range (10%, 20%, 80%). Linear regression was conducted to explore which EGG metrics explain the most variance in CPPs for vocal frequency and sound level. RESULTS Across frequency, CPPs was significantly lower in 80% compared to 10% and 20% ranges (P < 0.001). For sound level, CPPs was significantly lowest in the 10% compared to 20% (P = 0.012), followed by 80% range (P < 0.001). Across the vocal frequency range, dEGGmax, Entropy, and Qci individually explained 37%, 25.3%, and 0.19% of the variance, respectively, while across the vocal sound level range, they explained 66%, 65%, and 42% of the variance. CONCLUSIONS Separate CPPs norms are necessary for children's vocal frequency and sound level for research and clinical purposes; with EGG rate-of-change and variability as key contributors, especially across sound levels.

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