Much of folk psychology involves the attribution of intentional states (or more specifically as a subclass, propositional attitudes). Eliminativists point out that these states are generally ascribed syntactic and semantic properties. An example of this is the language of thought hypothesis, which attributes a discrete, combinatorial syntax and other linguistic properties to these mental phenomena. Eliminativists argue that such discrete and combinatorial characteristics have no place in the neurosciences, which speak of action potentials, spiking frequencies, and other effects which are continuous and distributed in nature. Hence, the syntactic structures which are assumed by folk psychology can have no place in such a structure as the brain. Against this there have been two responses. On the one hand, there are philosophers who deny that mental states are linguistic in nature and see this as a straw man argument. The other view is represented by those who subscribe to "a language of thought". They assert that the mental states can be multiply realized and that functional characterizations are just higher-level characterizations of what's happening at the physical level.