 Some philosophers are attracted to TT because they maintain that the meanings of FP mental state concepts show signs of being theoretical in character—namely, that such meanings are fixed by their having appropriate links or relations to other concepts in a structured theory. On this view, the meaning of mental states terms is defined holistically by the special roles the entities such terms denote play within a wider inferential network. Accordingly, the very meaning of a mental concept is taken to be determined by the distinctive role it plays within a network of principles. In this respect, our familiar mentalistic vocabulary (viz. our talk of thoughts, feelings, and expectations) would be similar in important respects to other theoretically embedded vocabularies (e.g., talk of electrons, atoms, and gravity).