It is a timely issue to understand the impact of bilingualism upon brain structure in healthy aging and upon cognitive decline given evidence of its neuroprotective effects. Plastic changes induced by bilingualism were reported in young adults in the left inferior parietal lobule (LIPL) and its right counterpart (RIPL) (Mechelli et al., 2004). Moreover, both age of second language (L2) acquisit...

presenting a brief description of bilingualism and its correlation with cognitive development and 3rd language learning, the present research primarily aims to compare the knowledge of english vocabulary and grammar in a sample of monolingual and bilingual high school students (fourth graders) of fars and khuzestan provinces in iran. to fulfill this objective, 448 monolingual and bilingual stud...