However, this assumption is not correct, since the fundamental error of regarding functional notions as categorial is unspecified with respect to the system of base rules exclusive of the lexicon. A consequence of the approach just outlined is that relational information may remedy and, at the same time, eliminate the levels of acceptability from fairly high (eg (99a)) to virtual gibberish (eg (98d)). I suggested that these results would follow from the assumption that the notion of level of grammaticalness raises serious doubts about a stipulation to place the constructions into these various categories. Clearly, most of the methodological work in modern linguistics delimits a descriptive fact. On our assumptions, the systematic use of complex symbols does not readily tolerate irrelevant intervening contexts in selectional rules.
see also: WikiPedia -- Chomskybot