Comparing perception and expression of tense morpheme of Verb in Persian language children and bilingual with specific language impairment

The goal of this study was to search verb morphology in bilingual with specific language impairment and comparing them with normal bilingual and Persian children with special language disorder because we want to find their ability in this skills in bilingual children with specific language impairment and and evaluating Low Capacity Processing(LCP) theory. Six bilingual (Azeri- Persian) children with specific language impairment and 6 Persian were selected from clinics of Tehran. They were 7-8 years old. Children with specific language impairment were evaluated about Perception and Expression tense morpheme of verbs and then they were compared with 6 age- matched-children as control groups. Children with specific language impairment are diagnosed as exhibiting a significant delay (more than one year) in language that can not be explained by intelligence deficits, hearing loss or visual impairment. In this research we used narrative speech and specific language impairment's test and we used Man Whitney's test for comparing these groups. Bilingual children with specific language impairment (SLI) have delay in comparison with their age- matched group in tense morphemes (p=0.020,p=0.019). They also have delay in tense of verbs(past, present, future) in comparison with Persian language children with special language impairment but it was not meaningful (p= 0.057). Comparison between typical development of bilingual children and bilinguals with SLI shows that verb morphology is a good clinical marker for diagnosing and treatment of these children. Comparison between Persian language children with SLI and bilinguals with SLI shows that there is no evidence for LCP theory.