How does language work, and how do we learn to speak? Why do languages change over time, and why do they have so many quirks and irregularities? In this original and totally entertaining book written in the same engaging style that illuminated his bestselling classics, The Language Instinct and How the Mind Works, Seven Pinker explores the profound mysteries of language. By picking a deceptively simple phenomenon--regular and irregular verbs--Pinker connects an astonishing array of topics in the sciences and the humanities: the history of languages; the theories of Noam Chomosky and his critics; the attempts to create language using computer simulations of neural networks; what there is to learn from children's grammatical "mistakes"; the latest techniques in identifying genes and imaging the brain; and major ideas in the history of Western philosophy. He makes sense of all this with the help of a single, powerful idea: that language comprises a mental dictionary of memorized words and a mental grammer of creative rules. His theory extends beyond language and offers insight in the very nature of the human mind.

"Grammars of natural languages can be expressed as mathematical objects, similar to computer programs. Such a formal presentation of grammars facilitates mathematical reasoning with grammars (and the languages they denote), as well as computational implementation of grammar processors. This book presents one of the most commonly used grammatical formalisms, Unification Grammars, which underlies contemporary linguistic theories such as Lexical-Functional Grammar (LFG) and Head-driven Phrase Structure Grammar (HPSG). The book provides a robust and rigorous exposition of the formalism that is both mathematically well-founded and linguistically motivated. While the material is presented formally, and much of the text is mathematically oriented, a core chapter of the book addresses linguistic applications and the implementation of several linguistic insights in unification grammars. Dozens of examples and numerous exercises (many with solutions) illustrate key points. Graduate students and researchers in both computer science and linguistics will find this book a valuable resource"--Provided by publisher.