Deep structure and surface structure
Deep structure and surface structure (also D-structure and S-structure, although these abbreviated forms are sometimes used with distinct meanings) concepts are used in linguistics, specifically in the study of syntax in the Chomskyan tradition of transformational generative grammar.
The deep structure of a linguistic expression is a theoretical construct that seeks to unify several related structures. For example, the sentences "Pat loves Chris" and "Chris is loved by Pat" mean roughly the same thing and use similar words. Some linguists, Chomsky in particular, have tried to account for this similarity by positing that these two sentences are distinct surface forms that derive from a common (or very similar) deep structure.
Chomsky coined and popularized the terms "deep structure" and "surface structure" in the early 1960s. American linguist Sydney Lamb wrote in 1975 that Chomsky "probably [borrowed] the term from Hockett". American linguist Charles Hockett first used the dichotomous pair "deep grammar" vs "surface grammar" in his 1958 book titled A Course in Modern Linguistics. Chomsky first referred to these Hockettian concepts in his 1962 paper The Logical Basis of Linguistic Theory (later published as Current Issues in Linguistic Theory in 1964). In it Chomsky noted that "the difference between observational and descriptive adequacy is related to the distinction drawn by Hockett (1958) between 'surface grammar' and 'deep grammar', and he is unquestionably correct in noting that modern linguistics is largely confined in scope to the former."
In Chomskyan linguisticsEdit
In early transformational syntax, deep structures are derivation trees of a context free language. These trees are then transformed by a sequence of tree rewriting operations ("transformations") into surface structures. The terminal yield of a surface structure tree, the surface form, is then predicted to be a grammatical sentence of the language being studied. The role and significance of deep structure changed a great deal as Chomsky developed his theories, and since the mid-1990s deep structure no longer features at all (see minimalist program).
It is tempting to regard deep structures as representing meanings and surface structures as representing sentences that express those meanings, but this is not the concept of deep structure favoured by Chomsky. Rather, a sentence more closely corresponds to a deep structure paired with the surface structure derived from it, with an additional phonetic form obtained from processing of the surface structure. It has been variously suggested that the interpretation of a sentence is determined by its deep structure alone, by a combination of its deep and surface structures, or by some other level of representation altogether (logical form), as argued in 1977 by Chomsky's student Robert May. Chomsky may have tentatively entertained the first of these ideas in the early 1960s, but quickly moved away from it to the second, and finally to the third. Throughout the 1960s and 1970s, the generative semantics movement put up a vigorous defence of the first option, sparking an acrimonious debate, the "Linguistics Wars".
Chomsky noted in his early years that by dividing deep structures from surface structures, one could understand "slip of the tongue" moments (where someone says something that he did not intend) as instances where deep structures do not translate into the intended surface structure.
Extension to other fieldsEdit
The "surface" appeal of the deep structure concept soon led people from unrelated fields (architecture, music, politics, and even ritual studies) to use the term to express various concepts in their own work. In common usage, the term is often used as a synonym for universal grammar—the constraints which Chomsky claims govern the overall forms of linguistic expression available to the human species. This is probably due to the importance of deep structure in Chomsky's earlier work on universal grammar, though his concept of universal grammar is logically independent of any particular theoretical construct, including deep structure.
According to Middleton (1990), Schenkerian analysis of music corresponds to the Chomskyan notion of deep structure, applying to a two-level generative structure for melody, harmony, and rhythm, of which the analysis by Lee (1985) of rhythmical structure is an instance. (See also: Chord progression § Blues changes.)
- In the first formulations of transformational grammar, active and passive pairs had identical deep structures. As the theory developed, it became necessary to mark whether a sentence was active or passive in the deep structure itself, with the result that active/passive pairs had almost-but-not-quite identical deep structures.
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- Lamb 2006, p. 179
- Chomsky 1964, p. 30
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