Aspects of the Theory of Syntax
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110 n 1 1 P4RNT RP.SIIM ED 030 113 AL 001 969 By -Schank. Roger C. Linguistics from a Conceptual Viewpoint(Aspects of Aspects of a Theory of Syqtax). Stanford'Univ.. Calif. Spons Agency -Department of Defense, Washington. D.C. Advanced Research-Pro;ectsAgency.; National Inst. of Mental Health (DHEW), Bethesda, Md. Report No-MEMO -AI -88 Pub Date 21 Apr 69 Note -23p. EDRS Price MF -$0.25 HC -$1.25 Descriptors-Child Language. Cognitive ProCesses, Computational Linguistics,*Concept Formation, *Language Universals. *Linguistic Competence, Linguistic Performance. *LinguisticTheory. Models. Semantics, Syntax, *Transformation Generative Grammar Identifiers-*Aspects Of The Theory 'Of *Syntax. Chomsky Noam. ConceptualParser. Stanford Artificial Inteliigence Project . Some of the assertions made by Chomsky in "Aspectsof the Theory of Syntax" are considered.In particular. the" ..notion of a "competence:" model inlinguistics is criticized. Formal postulates for a *Conceptually-basedlinguistic theory are presented. (Author/JD) April 21, 1969 STANFORD ARTIFICIALINTELLIGENCE PROJECT MEMO AI-88 WELFARE U.S. DEPARTMENT OFHEALTH, EDUCATION & OFFICE OF EDUCATION RECEIVED FROM THE THIS DOCUMENT HAS BEENREPRODUCED EXACTLY AS POINTS OF VIEW OROPINIONS PERSON OR ORGANIZATIONORIGINATING IT. REPRESENT OFFICIM. OFFICEOF EDUCATION STATED DO NOT NECESSARILY POSITION OR POLICY. Linguistics from a Conceptual Viewpoint (Aspects of Apects of a Theory ofSyntax) by Roger C. Schank Theory ABSTRACT: Some of the assertions madeby Chomsky in AspecIs_of the of Syntax are considered. In particular, the notion of a competence' model in linguistics iscriticized. Formal pos- tulates for a conceptually-basedlinguistic theory are presented. This research is supported by GrantPHS MH 06645-07 from the National Institute of Mental Health, and(in part) by the Advanced Research Projects Agency of the Office ofthe Secretary of Defense(SD-183). AL001969 Linguistics from a Conceptual Viewpoint (Aspects of Aspects of a Theory of Syntax) 1. Although linguistics is often referred to as the 'science of language', it has been usual for linguists to resist this label and its concomitant expectations.With the exception of the attempts of Bloch (19)48) and Bloomfield (1926) at establishing postulates for language, the formaliza- tion that is often present in a science was difficult to find before 1957. With the advent of transformational generative grammar however, the direction of the bulk of linguistic research changed considerably. Linguists who are in the transformational camp tend to be more concerned with precision and formalization than was common in the past. It is perhaps enlightening to attempt to discover just how valid the assumptions that have led to the present conception of transformational grammar are; and, if they are not valid, agood question is just what assump- tions might be considered valid. Initially, transformational theory dealt only with kernelsand transforms. The kernels were the output of the PSG and certain obligatory transformations. Thus a transformational grammar was simply a specification of the permutations involved in correcting the output of a PSG. This system was still used until itbecame clear that it was insufficient to handle all the complexities involved in natural language. Bach (1964) stated that 'The minimal requirement that we can place on a theory about a particularlanguage is that it specify or predict all and only the sentences of the language'. Until this time, these were precisely the requirements that were placed on a transformational grammar. Hawever, two important problems resulted from this view ofwhat a linguistic theory was to accomplish. The first was that the systom of phrase structure gram- mar and the transformationsthat were added simply did not account for all the sentences of English. The second problem is that the system As it stood could not be extended to other languages without completel.y revampingboth components in such a way that the two grammarswould be very dissimilar. This clearly is in contradiction to a fact of language that we know verywell.. Namely, than any baby possesses the mechanisms to learn any language andthat therefore, there must be some similarity between languages. Furthermore, this similarity should pervade the grammars of different languagessuch that things like translatability can be explained. Thus it appeared obvious that an important step towards solving both the first and second problems would be the positing of aUniversal grammar that would hold forall languages and a particular grammar for each language. Therefore, since the framework was alraady available, the phrase .01.1.04601* r s I structure component began tobe utilized as the basis for auniversal base component. (As Robinson [1968] points out this was arelatively arbitrary decision.) At this pointChomsky's AsEstsof the_l_y_lheor c_layr._IS.2.x appeared. , L - ......MW down the 'mainbackground 2. In Chapter I ofAspects, Chomsky sets examine some assumptions' of transformationaltheory. It is worthwhile to of these assumptionsin detail. assumption that hemakes is The first and perhapsmost important (the speaker-hearer'sknow- the 'fundamentaldistinction between competence (the actual use of languagein con- ledge of hislanguage) and performance cretesituations) [p.4] that he sets up. performance provides for This distinction betweencompetence and make their statementsabout transformationalists theplatform from which to discussion of what a'performance' transformations. Chomsky includes in his limitations, inattention,distraction model should do,factors such as memory 'competence' the formal- and non-linguisticknowledge. He thus leaves for speaker-hearer's know- ization of linguistic processesrepresentative of the ledge of the language. however. It is This relegation ofcompetence makes abasic mistake of linguistic know- necessary todifferentiate theproblem of formalization from the simulationof linguistic ledge and processes,i.e., competence, and cannot be labeled as knowledge and processes. This simulation is not There is a differencebetween the what Chomsky wouldcall 'performance'. simulation of actualverbal simulation of knowledgeand processes and the Chomsky does, of theideal behavior. It is here that wemust speak, as speaker-hearer is notinattentive or dis- speaker-hearer. Clearly the ideal and non-linguisticknow- tracted. He does howeverhave memory limitations what must be simulated as aninclusive part of ledge. This is certainly which Chomsky linguistic theory. The kind of theoryof 'performance' of future to which Chomskyrelegates it. speaks may well be inthe far distant is not so far off. It would However, a theory ofsimulative performance seem very reasonablethat the possibility of the construction of alinguistic theory that both accounts for the dataand does this in such a way as to appear to be consonantwith the human method for doing so, is not so remote. Clearly, such a theory must deal withnon-linguistic knowledge and problems of human memory as well as theprdblems that Chomsky designates as'competence'. Thus, it seems that the distinctionbetween competence and performance is a contrived one at best. In particular, after elimination of someGI the be- havioristic problems such as distraction, we canexpect to find a linguistic theory that is neither one of'competence' or 'performance' but something in between and therefore partiallyinclusive of both. On Page 139 Chomsky states: Thus it seems absurd to suppose thatthe speaker first forms a generalizedPhrase-marker by base rules and then tests itfor well-formedness by applying transformationalrules to see if it gives, finally, a well-formed sentence. But this absurdity is simply a corollary to the deeperabsurdity of regarding the sys- tem of generative rules as apoint-by-point model for the actual construction of a sentence by aspeaker. The system presented in a theoryof simulativr, performance, on the other hand, would be an attempt atformulating a system of rules that are of a sentence by a speaker. a point-by-pointmodel for the actual construction Furthermore, this system should be apoint-by-point model for theactual analysis of a sentence by a hearer.These aims even if they areattainable would be largely unverifiable exceptby the use of computers assimulative devices. On page 141 Chomsky.further statesthat: 6 The grammar does not, initself, provide any sensible procedure for finding the deepstructure of a given sentence, or for producing a given sentence,just as it provides nosensible procedure for finding aparaphrase to a given sentence. It merely defines these tasks in a precise way. A performance model must certainly incorporate a grammar;it is not to be confusedwith a grammar. Thus it would be wise totake the notion of asimulative perfor- and mance model asbeing somewhere betweenChomsky's notion of competence performance. Perhaps the notionof grammar too, shouldlie somewhere between Chomsky's notion of a grammar andthe incorporation of a grammar. Chomsky describes a grammarof a language as'a description of the and calls this a'genera- ideal speaker-hearer'sintrinsic competencev[p.4] 'generative grammar' tive grammar'. It is reasonable toconsider whether a describing what Chomsky in a large sense mightalso concern itself with calls 'competence', but in a wayin which the idealspeaker-hearer does so; considerations as the speaker- in particular withoutexcluding such important hearer's knowledge of theworld. Now it is possible toredefine the notion of a'fully adequate