Welcome to the Department of Linguistics.

Linguistics is the scientific study of human language, from the sounds and gestures of speech up to the organization of words, sentences, and meaning. Linguistics is also concerned with the relationship between language and cognition, society, and history.

The Department of Linguistics at the University of Pennsylvania is the oldest modern linguistics department in the United States, founded by Zellig Harris in 1947. The department is known for its interdisciplinary research, spanning many subfields of linguistics, as well as integration of theory, corpus research, field work, and cognitive and computer science.

The department has both a graduate Ph.D. program and undergraduate major and minors. For the specializations of our faculty, please see the research section.

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The Atlas of North American English provides the first overall view of the pronunciation and vowel systems of the dialects of the U.S. and Canada. The Atlas re-defines the regional dialects of American English on the basis of sound changes active in the 1990s and draws new boundaries reflecting those changes. It is based on a telephone survey of 762 local speakers, representing all the urbanized areas of North America.

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This volume, which completes Labov’s seminal Principles of Linguistic Change trilogy, examines the cognitive and cultural factors responsible for linguistic change, tracing the life history of these developments, from triggering events to driving forces and endpoints. It explores the major insights obtained by combining sociolinguistics with the results of dialect geography on a large scale; demonstrates under what conditions dialects diverge from one another; and establishes an essential distinction between transmission within the community and diffusion across communities.

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In this book Robin Clark explains in an accessible manner the usefulness of game theory in thinking about a wide range of issues in linguistics. Clark argues that we use grammar strategically to signal our intended meanings: our choices as speaker are conditioned by what choices the hearer will make interpreting what we say. Game theory — according to which the outcome of a decision depends on the choices of others — provides a formal system that allows us to develop theories about the kind of decision making that is crucial to understanding linguistic behavior. Clark argues the only way to understand meaning is to grapple with its social nature: that it is the social that gives content to our mental lives. The resulting theory of use will allow us to account for many aspects of linguistic meaning, and the grammar itself can be simplified. The book includes an extended argument in favor of the social basis of meaning; a brief introduction to game theory, with a focus on coordination games and cooperation; discussions of common knowledge and games of partial information; models of games for pronouns and politeness; and the development of a system of social coordination of reference.

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Drawing on cutting-edge developments in biology, neurology, psychology, and linguistics, Charles Yang's The Infinite Gift takes us inside the astonishingly complex but largely subconscious process by which children learn to talk and to understand the spoken word. Yang also puts forth an exciting new theory that we learn our native languages in part by unlearning the grammars of all the rest.

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All languages have exceptions alongside overarching rules and regularities. How does a young child tease them apart within just a few years of language acquisition? In this book, drawing an economic analogy, Charles Yang argues that just as the price of goods is determined by the balance between supply and demand, the price of linguistic productivity arises from the quantitative considerations of rules and exceptions. The learner postulates a productive rule only if it results in a more efficient organization of language, with the number of exceptions falling below a critical threshold. 

Supported by a wide range of cases with corpus evidence, Yang's Tolerance Principle gives a unified account of many long-standing puzzles in linguistics and psychology, including why children effortlessly acquire rules of language that perplex otherwise capable adults. His focus on computational efficiency provides novel insight on how language interacts with the other components of cognition and how the ability for language might have emerged during the course of human evolution.

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This book examines the diversity among American dialects and presents the counterintuitive finding that geographically localized dialects of North American English are increasingly diverging from one another over time. Labov describes the political forces that drive these ongoing changes, as well as the political consequences in public debate. The author also considers the recent geographical reversal of political parties in the Blue States and the Red States and the parallels between dialect differences and the results of recent presidential elections. Finally, in attempting to account for the history and geography of linguistic change among whites, Labov highlights fascinating correlations between patterns of linguistic divergence and the politics of race and slavery, going back to the antebellum United States. Complemented by an online collection of audio files that illustrate key dialectical nuances, Dialect Diversity in America offers an unparalleled sociolinguistic study from a preeminent scholar in the field.