Μorphosyntactic Errors in the Language of Greek-Speaking Individuals With Down Syndrome: Examining Relative Clauses.

Down syndrome (DS) is the most common intellectual disability genetic syndrome and presents a distinct linguistic profile. The present study aims to investigate the production of relative clauses (RCs) in 30 Greek-speaking individuals with DS (24.28 years old) and compare it to that of 40 typically developing (TD) children matched (a) for mental age (n = 20, 5.95 years old) and (b) for linguistic abilities (n = 20, 4.16 years old). Using an elicited production task, the groups were assessed for their total performance in the task, the proportion of incorrect responses in subject and object RCs, and the total number of grammatical errors produced. The results indicated that individuals with DS performed worse compared to TD children producing significantly more morphosyntactic errors.