Cross-linguistic influence in bilingual morphosyntactic acquisition

The interaction between the bilingual child’s two languages, coined as Cross-linguistic influence (CLI), is a well-reported phenomenon in bilingual language development. Although CLI has long dominated bilingualism research, issues about its nature (a representational change or by-product of language co-activation), timing and duration remain less well understood. Is CLI only observed during early bilingual development, and does it fade away as children grow older? Does it lead to qualitative and quantitative differences in language development between bilinguals and monolinguals? The present chapter addresses these questions by reviewing state-of-the-art studies reporting CLI in simultaneous and sequential bilingual children’s acquisition of morphology and syntax. We also discuss how extra-linguistic factors such as age of acquisition, dominance, input quality and quantity modulate CLI.