Acquiring and Processing Two Languages in One Brain

This chapter examines the acquisition, storage and processing of second languages (L2).We delve into neurological methods used in L2 research, highlighting their findings. Additionally, we discuss key factors in L2 acquisition such as age and L1/L2 differences. We also review theories on mental lexicon and syntactic/semantic processing in L2, and how L2 learning impacts brain structure and cognition. Finally, we address the ambiguity surrounding definitions of L2 proficiency and call for clarity in research methodologies.