Date of Award


Degree Name

Master of Science


Communication Disorders and Sciences

First Advisor

Boyer, Valerie


The purpose of this study was to describe the phonetic repertoire of late 8 phonemes among adolescents and young adults with Down syndrome and then determine the relationship between age and presence of the latest developing phonemes as well as their impact on intelligibility. This study also described the stimulability profile for those late 8 phonemes that were produced in error. The Arizona Articulation and Phonology Scale was administered to individuals with Down syndrome between the ages of 12 – 21;11 to obtain a phonetic profile. Among those participants included in the study, on average, 87.5% of the late 8 phonemes were present. Seven of eight participants were stimulable for all phonemes that were misarticulated. Results did not indicate a significant correlation between either age or intelligibility and the presence of late 8 phonemes.




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