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"The anecdotal view of language acquisition is that children learn language with apparent ease, no instruction, and in very little time, while adults find learning a new language to be cognitively challenging, laborintensive, and time-consuming. In this book Herschensohn examines whether early childhood is a critical period for language acquisition after which individuals cannot learn a language as native speakers. She argues that a first language is largely susceptible to age constraints, showing major deficits past the age of twelve. Second language acquisition also shows age effects, but with a range of individual differences. The competence of expert adult learners, the unequal achievements of child learners of second languages, and the lack of consistent evidence for a maturational cut-off, all cast doubt on a critical period for second language acquisition."

"Recent years have seen a revolution in our knowledge of how children learn to think and speak. In this volume, leading scholars from these rapidly evolving fields of research examine the relationship between child language acquisition and cognitive development. At first sight recent advances in the two areas seem to have moved in opposing directions: the study of language acquisition has been especially concerned with diversity, explaining how children learn languages of widely different types, while the study of cognitive development has focused on uniformity, clarifying how children build on fundamental, presumably universal, concepts. This book brings these two vital strands of investigation into close dialogue, suggesting a new synthesis in which the process of language acquisition may interact with early cognitive development. It provides original empirical contributions, based on a variety of languages, populations, and ages, and theoretical discussions that cut across the disciplines of psychology, linguistics, and anthropology."