 For instance, versions of conceptual role semantics imply that there is an essential link between mental content and belief as do versions of informational theories of content (Dretske 1981; Fodor 1990), although the latter are typically coupled with a non-normativist account of belief. Another line of reasoning appeals to the idea that there is a constitutive connection between grasping a concept, understanding a content, and using it in the propositional attitudes.