linguistics, scientific study of language, covering the structure (morphology and syntax; see grammar), sounds (phonology), and meaning (semantics), as well as the history of the relations of languages to each other and the cultural place of language in human behavior. Phonetics, the study of the sounds of speech, is generally considered a separate (but closely related to) field from linguistics.

Early Linguistics

Before the 19th cent., language was studied mainly as a field of philosophy. Among the philosophers interested in language was Wilhelm von Humboldt, who considered language an activity that arises spontaneously from the human spirit; thus, he felt, languages are different just as the characteristics of individuals are different. In 1786 the English scholar Sir William Jones suggested the possible affinity of Sanskrit and Persian with Greek and Latin, for the first time bringing to light genetic relations between languages. With Jones's revelation the school of comparative historical linguistics began. Through the comparison of language structures, such 19th-century European linguists as Jakob Grimm, Rasmus Rask, Karl Brugmann, and Antoine Meillet, as well as the American William Dwight Whitney, did much to establish the existence of the Indo-European family of languages.

Structural Linguistics

In the 20th cent. the structural or descriptive linguistics school emerged. It dealt with languages at particular points in time (synchronic) rather than throughout their historical development (diachronic). The father of modern structural linguistics was Ferdinand de Saussure, who believed in language as a systematic structure serving as a link between thought and sound; he thought of language sounds as a series of linguistic signs that are purely arbitrary, as can be seen in the linguistic signs or words for horse: German Pferd, Turkish at, French cheval, and Russian loshad'. In America, a structural approach was continued through the efforts of Franz Boas and Edward Sapir, who worked primarily with Native American languages, and Leonard Bloomfield, whose methodology required that nonlinguistic criteria must not enter a structural description. Rigorous procedures for determining language structure were developed by Kenneth Pike, Bernard Bloch, Charles Hockett, and others.

See also structuralism.

Transformational-Generative Grammar

In the 1950s the school of linguistic thought known as transformational-generative grammar received wide acclaim through the works of Noam Chomsky. Chomsky postulated a syntactic base of language (called deep structure), which consists of a series of phrase-structure rewrite rules, i.e., a series of (possibly universal) rules that generates the underlying phrase-structure of a sentence, and a series of rules (called transformations) that act upon the phrase-structure to form more complex sentences. The end result of a transformational-generative grammar is a surface structure that, after the addition of words and pronunciations, is identical to an actual sentence of a language. All languages have the same deep structure, but they differ from each other in surface structure because of the application of different rules for transformations, pronunciation, and word insertion. Another important distinction made in transformational-generative grammar is the difference between language competence (the subconscious control of a linguistic system) and language performance (the speaker's actual use of language). Although the first work done in transformational-generative grammar was syntactic, later studies have applied the theory to the phonological and semantic components of language.

Other Areas of Linguistic Study

In contrast to theoretical schools of linguistics, workers in applied linguistics in the latter part of the 20th cent. have produced much work in the areas of foreign-language teaching and of bilingual education in the public schools (in the United States this has primarily involved Spanish and, in the Southwest, some Native American languages in addition to English). In addition, such subfields as pragmatics, sociolinguistics, and psycholinguistics have gained importance.

Branch of linguistics concerned with examining changes in phonology, grammar, and semantics during a language's evolution, reconstructing earlier stages, and uncovering evidence of the influence of other languages. Its roots are in Classical and medieval writings on etymology and in the comparative study of Greek and Latin during the Renaissance. Only in the 19th century did more scientific language-analysis methods lead to the development of historical linguistics as a scholarly discipline. The Neogrammarians, a group of German linguists who formulated sound correspondences in the Indo-European languages, were especially influential. In the 20th century the methods of historical linguistics were extended to other language groups.

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Study of the nature and structure of language. It traditionally encompasses semantics, syntax, and phonology. Synchronic linguistic studies aim to describe a language as it exists at a given time; diachronic studies trace a language's historical development. Greek philosophers in the 5th century BC who debated the origins of human language were the first in the West to be concerned with linguistic theory. The first complete Greek grammar, written by Dionysus Thrax in the 1st century BC, was a model for Roman grammarians, whose work led to the medieval and Renaissance vernacular grammars.

With the rise of historical linguistics in the 19th century, linguistics became a science. In the late 19th and early 20th centuries Ferdinand de Saussure established the structuralist school of linguistics (see structuralism), which analyzed actual speech to learn about the underlying structure of language. In the 1950s Noam Chomsky challenged the structuralist program, arguing that linguistics should study native speakers' unconscious knowledge of their language (competence), not the language they actually produce (performance). His general approach, known as transformational generative grammar, was extensively revised in subsequent decades as the extended standard theory, the principles-and-parameters (government-binding) approach, and the minimalist program. Other grammatical theories developed from the 1960s were generalized phrase structure grammar, lexical-functional grammar, relational grammar, and cognitive grammar. Chomsky's emphasis on linguistic competence greatly stimulated the development of the related disciplines of psycholinguistics and neurolinguistics. Other related fields are anthropological linguistics, computational linguistics, mathematical linguistics, sociolinguistics, and the philosophy of language.

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Use of digital computers in linguistics research. The simplest examples are the use of computers to scan text and produce such aids as word lists, frequency counts, and concordances. From the mid-1950s to the mid-1960s progress was made by research groups working on machine translation and information retrieval. Theoretical CL deals with formal theories about linguistic knowledge, which today have reached a degree of complexity that can only be managed using powerful computers. Applied CL focuses on practical results of modeling human language use.

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