The language experience of children developing in linguistically diverse environments is subject to considerable variation both in terms of quantity and quality of language exposure. It is an open question how to investigate language exposure patterns and more important which factors are relevant for successful language learning. For example, children acquiring a minority language, including a signed language, are exposed to less variety of input than children acquiring a more global language. This is because they are living in a smaller linguistic community and with fewer occasions to use the language in everyday life. Despite this reduced input, most native signers are successful language learners. In contrast native language competence is not always achieved in signing deaf children with hearing parents or those with cochlear implants learning a spoken language. A similar outcome but with very different reasons has also been reported for hearing children with language impairment. In these populations acquisition of morphosyntactic aspects is developing atypically ending with an uncomplete linguistic repertoire. The circumstances of exposure during language development tend to differ in significant ways with respect to a large number of factors, such as, (i) length, quality and quantity of input, (ii) social status and attitudes toward the language, (iii) cognitive abilities required for language learning, and (iv) age of first exposure. Having early exposure to a range of different speakers is important in the acquisition of any language and may affect language proficiency. However, negative societal attitudes or a cognitive based disadvantage may create an unfavourable learning environment that prevents language learning from surfacing typically. This situation inevitably generates a different type of exposure for the child and consequently different language competence. In this Research Topic we intend to encourage the debate on social, linguistic and cognitive factors at play for designing an effective environment for language acquisition aiming at integrating linguistic variables coming from theoretical studies on language with environmental variables, such as, measures of language input or cognitive abilities on functions ancillary to language development.

In recent years the field has seen an increasing realisation that the full complexity of language acquisition demands theories that (a) explain how children integrate information from multiple sources in the environment, (b) build linguistic representations at a number of different levels, and (c) learn how to combine these representations in order to communicate effectively. These new findings have stimulated new theoretical perspectives that are more centered on explaining learning as a complex dynamic interaction between the child and her environment. This book is the first attempt to bring some of these new perspectives together in one place. It is a collection of essays written by a group of researchers who all take an approach centered on child-environment interaction, and all of whom have been influenced by the work of Elena Lieven, to whom this collection is dedicated.

A clear and practical introduction to second language acquisition, written for students encountering the topic for the first time.

Third language acquisition is a common phenomenon, which presents some specific characteristics as compared to second language acquisition. This volume adopts a psycholinguistic approach in the study of cross-linguistic influence in third language acquisition and focuses on the role of previously acquired languages and the conditions that determine their influence.

This book examines the linkage between literacy and linguistic diversity, embedding them in their social and cultural contexts. It illustrates that a more complete understanding of literacy among diverse populations and in multicultural societies requires attention to issues of literacy per se as well as to improving an educational process that has relevance beyond members of majority cultures and linguistic groups. The focus of the book is on the social and cultural contexts in which literacy develops and is enacted, with an emphasis on the North American situation. Educators and researchers are discovering that cognitive approaches, while very valuable, are insufficient by themselves to answer important questions about literacy in heterogeneous societies. By considering the implications of family, school, culture, society, and nation for literary processes, the book answers the following questions. In a multi-ethnic context, what does it mean to be literate? What are the processes involved in becoming and being literate in a second language? In what ways is literacy in a second language similar and in what ways is it different from mother-tongue literacy? What factors must be understood to better describe and facilitate literacy acquisition among members of ethnic and linguistic minorities? What are some current approaches that are being used to accomplish this? These are vital questions for researchers and educators in a world that has a large number of immigrants, a variety of multi-ethnic and multi-lingual societies, and an increasing degree of multinational activity. Beyond addressing applied concerns, attending to these questions can provide new insights into basic aspects of literacy.

Whether we grow up with one, two, or several languages during our early years of life, many of us will learn a second, foreign, or heritage language in later years. The field of Second language acquisition (SLA, for short) investigates the human capacity to learn additional languages in late childhood, adolescence, or adulthood, after the first language --in the case of monolinguals-- or languages --in the case of bilinguals-- have already been acquired. Understanding Second Language Acquisition offers a wide-encompassing survey of this burgeoning field, its accumulated findings and proposed theories, its developed research paradigms, and its pending questions for the future. The book zooms in and out of universal, individual, and social forces, in each case evaluating the research findings that have been generated across diverse naturalistic and formal contexts for second language acquisition. It assumes no background in SLA and provides helpful chapter-by-chapter summaries and suggestions for further reading. Ideal as a textbook for students of applied linguistics, foreign language education, TESOL, and education, it is also recommended for students of linguistics, developmental psycholinguistics, psychology, and cognitive science. Supporting resources for tutors are available free at www.routledge.com/ortega.