Date of Award


Document Type


Degree Name

Master of Science (MS)


Communication Sciences & Disorders


This study investigated and compared the acoustic properties of vowels in ventriloquial and normal speech. Voice recordings of a 51 year-old male participant producing 10 words containing target vowels, three times each were made in both normal and ventriloquial speech. Standard acoustic measures for frequency were gathered using Tiger Electronics Inc., Dr. Speech Science, Ver.2.0. Fundamental frequency, first, and second formant frequencies were analyzed as compared between the two types of speech. Although the results revealed no statistically significant differences in first and second formant frequencies, slight variations do exist. Statistically significant differences were found for two words in fundamental frequency. The results would seem to suggest that as long as vowel production is within a “range” of variability, vowels may be accurately perceived.