This volume brings together seven empirical studies about aptitude-treatment interactions (ATI), i.e., about how (second language) learners with different aptitudes match or don’t match with different educational treatments; and aptitude-testing interactions, i.e., about how learners with different aptitudes perform better or worse depending on the way their knowledge and skills are tested. The authors are all established researchers or rising stars in the field of second language acquisition (SLA), who believe that little can be said about the effectiveness of teaching and testing methods or techniques without taking individual differences into account. Many of the studies corroborate in SLA what has become a central finding in the psychological and educational research about ATI: the more a method puts the burden of information processing on the student, the bigger the role of the corresponding aptitudes. The kinds of findings documented in this volume contribute to a scientific basis for the art of language teaching that will become increasingly useful as emerging technologies make adaptation to individuals and groups more feasible. Originally published as special issue of Journal of Second Language Studies 2:2 (2019).

Introduction to Instructed Second Language Acquisition is the first book to present a cohesive view of the different theoretical and pedagogical perspectives that comprise instructed second language acquisition (ISLA), defined as any type of learning that occurs as a result of the manipulating the process and conditions of second language acquisition. The book begins by considering the effectiveness of ISLA and the differences between ISLA and naturalistic L2 learning. It then goes on to discuss the theoretical, empirical, and pedagogical aspects of such key issues in ISLA as grammar learning; interaction in the classroom; focus on form, function and meaning; vocabulary learning; pronunciation learning; pragmatics learning; learning contexts; and individual differences. This timely and important volume is ideally suited for the graduate level ISLA course, and provides valuable insights for any SLA scholar interested in the processes involved in second language learning in classroom settings.

Second language learners differ in how successfully they adapt to, and profit from, instruction. This book aims to show that adaptation to L2 instruction, and subsequent L2 learning, is a result of the interaction between learner characteristics and learning contexts. Describing and explaining these interactions is fundamentally important to theories of instructed SLA, and for effective L2 pedagogy. This collection is the first to explore this important issue in contemporary task-based, immersion, and communicative pedagogic settings. In the first section, leading experts in individual differences research describe recent advances in theories of intelligence, L2 aptitude, motivation, anxiety and emotion, and the relationship of native language abilities to L2 learning. In the second section, these theoretical insights are applied to empirical studies of individual differences-treatment interactions in classroom learning, experimental studies of the effects of focus on form and incidental learning, and studies of naturalistic versus instructed SLA.

Research on second language acquisition (SLA) has identified language aptitude and age of onset (AO), i.e., the age at which learners are first meaningfully exposed to the L2, as robust predictors of rate of classroom language learning and level of ultimate L2 attainment in naturalistic settings, respectively. It is not surprising, therefore, that recent years have witnessed a surge of interest in the combination of age and aptitude as a powerful explanatory factor in SLA, and central to a viable SLA theory. The chapters in this volume provide new studies and reviews of research findings on age effects, bilingualism effects, maturational constraints and sensitive periods in SLA, the sub-components of language aptitude and the development of new aptitude measures, the influence of AO and aptitude in combination on SLA, aptitude-treatment interactions, and the implications of the research findings for language education policy and tailored language instruction.

Language Aptitude: Advancing Theory, Testing, Research and Practice brings together cutting-edge global perspectives on foreign language aptitude. Drawing from educational psychology, cognitive science, and neuroscience, the editors have assembled interdisciplinary authors writing for an applied linguistics and education audience. The book is broken into five major themes: revisiting and updating current language aptitude theories and models; emerging insights from contemporary research into language aptitude and the age factor or the critical period hypothesis; redefining constructs and broadening territories of foreign language aptitude; exploring language aptitude from a neurocognitive perspective; and exploring future directions of foreign language aptitude research. Focused on critical issues in foreign language aptitude and second language learning and teaching, this book will be an important research resource and supplemental reading in both applied linguistics and cognitive psychology.

The scope of individual learner differences is broad, yet there is no current, comprehensive, and unified volume that provides an overview of the considerable amount of research conducted on various language learner differences, until now.

The Routledge Encyclopedia of Second Language Acquisition offers a user-friendly, authoritative survey of terms and constructs that are important to understanding research in second language acquisition (SLA) and its applications. The Encyclopedia is designed for use as a reference tool by students, researchers, teachers and professionals with an interest in SLA. The Encyclopedia has the following features: • 252 alphabetized entries written in an accessible style, including cross references to other related entries in the Encyclopedia and suggestions for further reading • Among these, 9 survey entries that cover the foundational areas of SLA in detail: Development in SLA, Discourse and Pragmatics in SLA, Individual Differences in SLA, Instructed SLA, Language and the Lexicon in SLA, Measuring and Researching SLA, Psycholingustics of SLA, Social and Sociocultural Approaches to SLA, Theoretical Constructs in SLA. • The rest of the entries cover all the major subdisciplines, methodologies and concepts of SLA, from “Accommodation” to the “ZISA project.” Written by an international team of specialists, the Routledge Encyclopedia of Second Language Acquisition is an invaluable resource for students and researchers with an academic interest in SLA.