Summary
Purpose
This study reports on two experiments to examine vocal fold abduction and its relationship
with relative fundamental frequency (RFF), considering two attributes that have been
shown to elicit group differences in RFF: age (Experiment 1) and Parkinson's disease
(PD; Experiment 2).
Methods
For both experiments, simultaneous acoustic and nasendoscopic recordings were collected
as participants produced the utterance, /ifi/. RFF values were computed from the acoustic
signal, whereas abduction duration and glottic angle at voicing offset were identified
from the laryngoscopic images. In Experiment 1, 50 speakers with typical voices (18–83
years) were analyzed to examine (1A) the effects of speaker age on individual outcome
measures (RFF, abduction duration, glottic angle) via Pearson's correlation coefficients,
and (1B) the effects of abductory measures and age on RFF via an analysis of covariance.
In Experiment 2, 20 speakers with PD and 20 matched controls were analyzed to examine
(2A) the effects of group (with/without PD) on outcome measures via an analysis of
variance, and (2B) the relationship of RFF with abduction duration, glottic angle,
and age when considering group via an analysis of covariance.
Results
Age demonstrated a significant, negative relationship with glottic angle (1A) but
was not a significant factor when examining the relationship of vocal fold abduction
and RFF (1B). Speaker group (with/without PD) demonstrated a significant effect on
measures of RFF and abduction duration (2A) but was not a significant factor when
examining the relationship of vocal fold abduction and RFF (2B).
Conclusions
RFF is sensitive to changes in vocal fold abductory patterns during devoicing, irrespective
of speaker age or PD status.
Key Words
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Article info
Publication history
Published online: April 05, 2022
Accepted:
March 8,
2022
Publication stage
In Press Corrected ProofFootnotes
Disclosure: J.M. Vojtech receives financial compensation through employment by Delsys, Inc., a commercial company that manufactures, markets, and sells Electromyographic Sensors and other Physiological Measurement Systems. C.E. Stepp has received consulting fees from Altec, Inc. and Delsys, Inc., companies focused on developing and commercializing technologies related to human movement. Stepp's interests were reviewed and are managed by Boston University in accordance with their conflict of interest policies.
Funding: This work was supported by the National Science Foundation under Grant No. 1247312 (J.M.V.) and the National Institutes of Health under Grant No. DC015570 (C.E.S.).
Identification
Copyright
© 2022 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
