Comparing these examples with their parasitic gap counterparts in (96) and (97), we see that relational information is to be regarded as the ultimate standard that determines the accuracy of any proposed grammar. Clearly, most of the methodological work in modern linguistics is, apparently, determined by the traditional practice of grammarians. Nevertheless, the appearance of parasitic gaps in domains relatively inaccessible to ordinary extraction can be defined in such a way as to impose an abstract underlying order. From C1, it follows that the theory of syntactic features developed earlier raises serious doubts about an important distinction in language use. So far, the speaker-hearer's linguistic intuition is unspecified with respect to the strong generative capacity of the theory.
see also: WikiPedia -- Chomskybot