Some Vocal Effects of Different Reading Passages and Time Delays in Speech Feedback

Abstract

128 male students were studied for the effect of delayed speech feedback on vocal rate and duration. There was a lengthening of syllable duration, increased phonation time, in mean vocal intensity and a tendency for vocal intensity variations to become greater. Reading material seemed to be somewhat related to vocal changes but not to syllable duration. Variations in vocal intensity were related to various delays. The investigation demonstrates the necessity of controlling many more variables in these experiments than has been suspected.