This handbook provides a critical guide to the most central proposition in modern linguistics: the notion, generally known as Universal Grammar, that a universal set of structural principles underlies the grammatical diversity of the world's languages. Part I considers the implications of Universal Grammar for philosophy of mind and the philosophy of language, and examines the history of the theory. Part II focuses on linguistic theory, looking at topics such as explanatory adequacy and how phonology and semantics fit into Universal Grammar. Parts III and IV look respectively at the insights derived from UG-inspired research on language acquisition, and at comparative syntax and language typology, while part V considers the evidence for Universal Grammar in phenomena such as creoles, language pathology, and sign language. The book will be a vital reference for linguists, philosophers, and cognitive scientists.

In this book, Ian Roberts argues that the essential insight of the principles-and-parameters approach to variation can be maintained - albeit in a somewhat different guise - in the context of the minimalist programme. The book represents a significant new contribution to the formal study of cross-linguistic morphosyntactic variation.

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This book examines child second language acquisition within the Principles and Parameters theory of Universal Grammar (UG). Specifically, the book focuses on null-subjects in the developing grammars of children acquiring English as a second language. The book provides evidence from the longitudinal speech data of four child second language (L2) learners in order to test the predictions of a recent theory of null-subjects, namely, the Morphological Uniformity Principle (MUP). Lakshmanan argues that the child L2 acquisition data offer little or no evidence in support of the MUP s predictions regarding a developmental relation between verb inflections and null-subjects. The evidence from these child L2 data indicates that regardless of the status of null subjects in their first language, child L2 learners of English hypothesize correctly from the very beginning that English requires subjects of tensed clauses to be obligatorily overt. The failure on the part of these learners to obey this knowledge in certain structural contexts is the result of perceptual factors that are unrelated to parameter setting. The book demonstrates the value of child second language acquisition data in evaluating specific proposals within linguistic theory for a Universal principle.

Whether all human languages are fundamentally the same or different has been a subject of debate for ages. This problem has deep philosophical implications: If languages are all the same, it implies a fundamental commonality-and thus the mutual intelligibility-of human thought. We are now on the verge of answering this question. Using a twenty-year-old theory proposed by the world's greatest living linguist, Noam Chomsky, researchers have found that the similarities among languages are more profound than the differences. Languages whose grammars seem completely incompatible may in fact be structurally almost identical, except for a difference in one simple rule. The discovery of these rules and how they may vary promises to yield a linguistic equivalent of the Periodic Table of the Elements: a single framework by which we can understand the fundamental structure of all human language. This is a landmark breakthrough, both within linguistics, which will thereby become a full-fledged science for the first time, and in our understanding of the human mind.

AMERICAN SIGN LANGUAGE American Sign Language (ASL) is the visual-gestural language used by most of the deaf community in the United States and parts of Canada. On the surface, this language (as all signed languages) seems radically different from the spoken languages which have been used to formulate theories of linguistic princi ples and parameters. However, the position taken in this book is that when the surface effects of modality are stripped away, ASL will be seen to follow many of the patterns proposed as universals for human language. If these theoretical constructs are meant to hold for language in general, then they should hold for natural human language in any modality; and ifASL is such a natural human language, then it too must be accounted for by any adequate theory of Universal Grammar. For this rea son, the study of ASL can be vital for proposed theories of Universal Grammar. Recent work in several theoretical frameworks of syntax as well as phonology have argued that indeed, ASL is such a lan guage. I will assume then, that principles of Universal Gram mar, and principles that derive from it, are applicable to ASL, and in fact that ASL can serve as one of the languages which test Universal Grammar. There is an important distinction to be drawn, however, be tween what is called here 'American Sign Language', and other forms of manual communication.

These essays by an outstanding group of linguists present case studies in contemporary comparative grammar, illustrating the rich and varied ways in which the principles and parameters framework of generative grammar can provide explanations for both the underlying universal properties of the world's languages and the ways in which they differ. The final essay by Noam Chomsky offers a new perspective on the principles and parameters approach to comparative grammar. In his introduction, Freidin describes the historical background of current work in comparative grammar and compares this work to the comparative studies of the nineteenth century. He notes how the current approach traces the fundamental unity of all languages to the language faculty, in contrast to that of the nineteenth century which was primarily concerned with the ancestral relations among languages. The essays that follow convey the wide scope of the interaction between current theory and crosslinguistic studies. Topics include the relevance of binding theory for crosslinguistic studies; the interaction between the syntax/lexical semantics interface and the theory of UG; the role of phrase structure and levels of representation in accounting or syntactic variation; crosslinguistic variation in word order phenomena; and the ways in which the study of comparative grammar can itself contribute to the understanding of UG. Contributors Joseph Aoun. Adriana Belletti. Noam Chomsky. Robert Freidin. Wayne Harbert. Norbert Hornstein. C.-T. James Huang. Anthony S. Kroch. Howard Lasnik. Yen-hui Audrey Li. David Lightfoot. Luigi Rizzi. Ken Safir. Beatrice Santorini. Rex A. Sprouse. Timothy Stowell. Tarald Taraldsen. Lisa deMena Travis. Edwin Williams