VOWEL USE OF PHONOLOGICALLY DISORDERED IDENTICAL TWIN BOYS - A CASE-STUDY

Very little is known about the vowel systems of phonologically disorde red children. This study provides longitudinal data regarding vowel us e of identical twin boys between the ages of 3;5 and 4;9. The boys wer e identified as phonologically disordered; however, their parents chos e not to enroll them in therapy. Vowel-use information was taken from spontaneous language samples. It was discovered that initially their p honological disorder also affected their vowel systems, but as their p honological skills increased so did correct use of vowels and their vo wel use tended to follow normal developmental trends.