A Laminagraphic Study of Vocal Intensity

It has been suggested that vocal fold cross‐sectional area (or mass) varies as a function of vocal intensity. Since this notion has not been subjected to test, it was the purpose of this investigation to study the relationship of the coronal cross‐sectional area and mean thickness of the vocal folds to variation in vocal intensity. Subjects included eight males chosen on the bases of age, absence of voice problems, and the ability to produce specified vocal tones easily. The range of fundamental frequencies that each subject could produce was determined by a standard procedure. Final selection was made on the basis of these data and all subjects had essentially the same pitch ranges. Subjects were required to produce each of three vocal pitches at three vocal intensities. Pitches were specified in relation to total pitch range and were located as proportions above the lowest sustainable tone. The 10%, 25%, and 50% points to the nearest semi‐tone were used but since all subjects' ranges were similar, frequ...