Abstract
Measures of intrinsic laryngeal muscle activity, subglottal air pressure and vertical laryngeal position were obtained simultaneously on four adult male subjects while they sustained vocalization at frequencies between 100 and 400 Hz. A stepwise multiple regression analysis of the physiologic data showed that the only significant term for any one subject in predicting his vocal frequency was cricothyroid muscle activity. This single term explained over 90% of the variability in the vocal frequency produced. Pooled data from the group showed that three terms contributed significantly to vocal frequency: Cricothyroid activity alone resulted in an R2 of 67%, while adding subglottal air pressure measures increased R2 to 71% and adding the final term of cricothyroid times thyroarytenoid muscle activity increased R2 to 73%. For these subjects, intrinsic laryngeal muscle activity overshadowed any of the other forces thought to influence the frequency of sustained phonation. [Work supported by NIH.]
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