Adult second language acquisition: A selective overview with a focus on the learner linguistic system

This review article selects and elaborates on the important issues of adult second language acquisition research in the second decade of the twenty-first century. The fundamental question of whether adult second language acquisition and child first language acquisition are similar or different is addressed throughout the article. The issues of a critical period for acquisition, the importance of the linguistic input, and processing are discussed. Generative as well as usage-based perspectives are considered. Future research concerns and promising areas of investigation are proposed.