Journal article
A Model for Neurologic Sources of Aperiodicity in Vocal Fold Vibration
Journal of speech, language, and hearing research, Vol.34(3), pp.460-472
06/01/1991
DOI: 10.1044/jshr.3403.460
PMID: 2072669
Abstract
The time course of a force twitch in the thyroarytenoid muscle is modeled, and trains of twitches are summed to simulate force tetani. By incorporating means and standard deviations of motoneuron firing rates, and by applying random phase relationships between simulated motor units, a quantitative model of the ripple of vocal fold tension is obtained. From this ripple, perturbations in fundamental frequency are calculated as a function of the number of motor units in the muscle, the mean and standard deviation of the firing rate of dominant motoneurons, and the variability in the size (twitch amplitude) of the motor units. Predicted perturbations range between 0.2% and 1.2%, depending on the choice of parameters. Perturbation decreases with the number of motor units and with increased mean firing rate, but increases with the variability in motor unit size and with variability in the firing rate. Techniques are discussed by which neurologic jitter might be isolated from other sources of irregularity in vocal fold vibration.
Details
- Title: Subtitle
- A Model for Neurologic Sources of Aperiodicity in Vocal Fold Vibration
- Creators
- Ingo R. Titze - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of speech, language, and hearing research, Vol.34(3), pp.460-472
- DOI
- 10.1044/jshr.3403.460
- PMID
- 2072669
- ISSN
- 1092-4388
- eISSN
- 1558-9102
- Number of pages
- 13
- Language
- English
- Date published
- 06/01/1991
- Academic Unit
- School of Music; Communication Sciences and Disorders
- Record Identifier
- 9984719567802771
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