 After this, however, agreement breaks down. Representationalists regard beliefs as structures in the mind that represent the propositions they affirm—usually in something like a mental language (see Fodor 1975 and the entry on  language of thought).  Behavioralist-dispositionalists regard beliefs as dispositions to act in certain ways in certain circumstances (see Braithwaite 1932–1933). Eliminativists regard talk of “beliefs” as designating convenient fictions that we ascribe to people in folk psychology (see Churchland 1981 and the entry on  eliminative materialism).  Primitivists think of beliefs as basic mental states which do not admit of analysis. And so on. There is also a big controversy regarding whether the most fundamental concept here is of degrees of belief (or credences). 