Chapter 1 provides an overview of the major topics in linguistics and second language acquisition (SLA) that are particularly relevant for research with second language learners. The first half of Chapter 1 sets out the foundational concepts, and defines such major terms as linguistics, second language acquisition, and heritage speakers. The chapter addresses such influences on language acquisition as age of acquisition and input quantity and quality, comparing and contrasting different types of learner population (monolingual vs. bilingual, first language vs. second language learners vs. heritage speakers). The chapter provides a brief introduction to generative linguistics and generative SLA, discussing evidence for the biological foundations of language and for Universal Grammar. In the second half of Chapter 1, the discussion moves on to the implicit vs. explicit distinction, which is manifested in second language learning, knowledge, and instruction, and which is relevant both to the nature of teaching interventions and to the measurement of learners’ resulting knowledge.
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