In the linguistic literature, the term theme has several interpretations, one of which relates to discourse analysis and two others to sentence structure. In a more general (or global) sense, one may speak about the theme or topic (or topics) of a text (or discourse), that is, to analyze relations going beyond the sentence boundary and try to identify some characteristic subject(s) for the text (discourse) as a whole. This analysis is mostly a matter of the domain of information retrieval and only partially takes into account linguistically based considerations. The main linguistically based usage of the term theme concerns relations within the sentence. Theme is understood to be one of the (syntactico-) semantic relations and is used as the label of one of the arguments of the verb; the whole network of these relations is called thematic relations or roles (or, in the terminology of Chomskyan generative theory, theta roles and theta grids). Alternatively, from the point of view of the communicative function of the language reflected in the information structure of the sentence, the theme (or topic) of a sentence is distinguished from the rest of it (rheme, or focus, as the case may be) and attention is paid to the semantic consequences of the dichotomy (especially in relation to presuppositions and negation) and its realization (morphological, syntactic, prosodic) in the surface shape of the sentence. In some approaches to morphosyntactic analysis the term theme is also used referring to the part of the word to which inflections are added, especially composed of the root and an added vowel.
Throughout the 20th century, structuralist and generative linguists have argued that the study of the language system (langue, competence) must be separated from the study of language use (parole, performance), but this view of language has been called into question by usage-based linguists who have argued that the structure and organization of a speaker’s linguistic knowledge is the product of language use or performance. On this account, language is seen as a dynamic system of fluid categories and flexible constraints that are constantly restructured and reorganized under the pressure of domain-general cognitive processes that are not only involved in the use of language but also in other cognitive phenomena such as vision and (joint) attention. The general goal of usage-based linguistics is to develop a framework for the analysis of the emergence of linguistic structure and meaning.
In order to understand the dynamics of the language system, usage-based linguists study how languages evolve, both in history and language acquisition. One aspect that plays an important role in this approach is frequency of occurrence. As frequency strengthens the representation of linguistic elements in memory, it facilitates the activation and processing of words, categories, and constructions, which in turn can have long-lasting effects on the development and organization of the linguistic system. A second aspect that has been very prominent in the usage-based study of grammar concerns the relationship between lexical and structural knowledge. Since abstract representations of linguistic structure are derived from language users’ experience with concrete linguistic tokens, grammatical patterns are generally associated with particular lexical expressions.
Matthew J. Gordon
William Labov (b. 1927) is an American linguist who pioneered the study of variationist sociolinguistics. Born and raised in northern New Jersey, Labov studied English and philosophy at Harvard University (BA, 1948) and worked as an industrial chemist for several years before entering graduate school in linguistics at Columbia University in 1961. He completed his PhD in 1964, under the direction of Uriel Weinreich. He worked at Columbia until 1971, when he joined the faculty of the University of Pennsylvania, where he taught until his retirement in 2014.
Labov’s influence on the field began with research he conducted in graduate school. His study of changing pronunciations on Martha’s Vineyard, the subject of his master’s thesis, introduced a method for observing sound change in progress and broke with tradition by exploring social motivations for linguistic innovations. For his PhD dissertation, Labov carried out a study of dialect patterns on the Lower East Side of New York City. Using a systematic, quantitative methodology, he demonstrated that linguistic variation is socially stratified, such that the use of pronunciation features (e.g., dropping of post-vocalic /r/) correlates with social class, ethnicity, etc. in regular patterns. Labov’s early research was greatly influential and inspired many scholars to carry out similar projects in other communities. The paradigm came to be known as variationist sociolinguistics.
Much of Labov’s scholarship seeks to advance our understanding of language change. Historical linguists traditionally study completed linguistic changes, often long after they occurred, but Labov developed a method for examining active changes through a quantitative comparison of speakers representing several generations. This approach produces a new perspective on the change process by revealing intermediate stages. Labov has brought insights from this research to bear on theoretical debates within historical linguistics and the field more broadly. His work in this area has also documented many active sound changes in American English. Among these changes are innovations underway in particular dialects, such as the vowel changes in Philadelphia, as well as broader regional patterns, such as the Northern Cities Shift heard in the Great Lakes states.
Throughout his career, social justice concerns have fueled Labov’s research. He has sought to demonstrate that the speech of stigmatized groups is as systematic and rule-governed as any other. He led a pioneering study in Harlem in the late 1960s that shone new light on African American English, demonstrating, for example, that grammatical usages like the deletion of the copula (e.g., He fast) are subject to regular constraints. Labov has served as an expert witness in court and before the U.S. Congress to share insights from his study of African American English. He has also worked to promote literacy for speakers of non-standard dialects, carrying out research on reading and developing material for the teaching of reading to these populations.