Date of Award

Spring 1-1-2016

Document Type


Degree Name

Master of Arts (MA)


Speech, Language & Hearing Sciences

First Advisor

Pui Fong Kan

Second Advisor

Neerja Sadagopan

Third Advisor

Eliana Colunga


This longitudinal study compares the language profiles of a set of 8-year-old bilingual (English/Spanish) twins. One twin has a diagnosis of SLI and receives services, while the other has no documented language impairment. Standardized tests and language samples were administered in English and Spanish at three time points over a period of 9 months to assess their language profiles, rate of change in language skills and working memory skills. Analysis determined that while the twin with the diagnosis of SLI had a lower language profile overall, it is unclear whether the twin without a diagnosis performed below average due to a language difference or a language impairment. A difference in their performance on working memory tasks was noted and may be related to their differing perinatal health histories.