The Impact of Multilingualism on Second Language Acquisition: A Study of Cognitive and Linguistic Proficiency Among Ethnic Minority Groups

This study investigates the cognitive and linguistic differences in second language acquisition (SLA) among multilingual H'mong and Tay students compared to monolingual Kinh students in Vietnam. Using a mixed-methods approach, the study examined cognitive proficiency, including working memory and cognitive flexibility, as well as linguistic proficiency in English, focusing on vocabulary size, syntactic knowledge, and phonological accuracy. Quantitative data from cognitive and linguistic tests were analyzed using MANOVA, while qualitative data from focus group discussions provided insights into the sociocultural influences on language learning. The findings reveal that H'mong and Tay students exhibited higher cognitive proficiency, particularly in working memory and cognitive flexibility, than their monolingual Kinh peers. However, despite their cognitive advantages, multilingual students faced greater challenges in English vocabulary acquisition, syntax, and phonological accuracy, likely due to structural differences between their native languages and English. The qualitative findings highlight the role of sociocultural factors, including limited access to resources and the desire to maintain cultural identity, in shaping language learning experiences among ethnic minority students. The study concludes that while multilingualism enhances cognitive abilities, ethnic minority students require targeted instructional support to overcome linguistic barriers in SLA. The findings have implications for language education policies, particularly in designing culturally sensitive curricula and improving access to quality English education in rural and ethnic minority communities.