Issues regarding the organization and processing of the bilingual mental lexicon present a challenge for researchers interested in investigating second language acquisition. Research related to the memory of words for the bilingual’s two languages present different results, which intensify this debate. On one side of this debate, researchers support a theory that there is a shared storage for the lexicons of the first and second languages; on the other side, researchers support a theory that storage is separate. This debate also raises questions related to the activation of the bilingual’s two languages during lexical production. The present paper reviews two models of bilingual lexical and semantic memory (RHM and BIA+) and the studies associated with the models. The goal is to address whether semantic memory of the bilingual’s two languages is represented in an integrated way.
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