This paper discusses a study to demonstrate improvement in vowel articulation ability by direct acoustic measurement of the format frequencies of vowels before and after training.
Program in Audiology and Communication Sciences, Washington University School of Medicine
Rehabilitation of Speech and Language Disorders
Monsen, R. B.
Shaughnessy, Dale, "Vowel target articulation of the deaf" (1976). Independent Studies and Capstones. Paper 477. Program in Audiology and Communication Sciences, Washington University School of Medicine.