Over the last several decades, neuroscientists, cognitive psychologists, and psycholinguists have investigated the implicit and explicit continuum in language development and use from theoretical, empirical, and methodological perspectives. This book addresses these perspectives in an effort to build connections among them and to draw pedagogical implications when possible.

The volume includes an examination of the psychological and neurological processes of implicit and explicit learning, what aspects of language learning can be affected by explicit learning, and the effects of bilingualism on the mental processing of language. Rigorous empirical research investigations probe specific aspects of acquiring morphosyntax and phonology, including early input, production, feedback, age, and study abroad. A final section explores the rich insights provided into language processing by bilingualism, including such major areas as aging, third language acquisition, and language separation.

Heritage language (HL) learning and teaching presents particularly difficult challenges. Melding cutting-edge research with innovations in teaching practice, the contributors in this volume provide practical knowledge and tools that introduce new solutions informed by linguistic, sociolinguistic, and educational research on heritage learners. Scholars address new perspectives and orientations on designing HL programs, assessing progress and proficiency, transferring research knowledge into classroom practice, and the essential question of how to define a heritage learner. Articles offer analysis and answers on multiple languages, and the result is a unique and essential text—the only comprehensive guide for heritage language learning based on the latest theory and research with suggestions for the classroom.