 Heck distinguishes two different ways of drawing the conceptual/nonconceptual distinction. According to the content view, there is a fundamental difference between the type of content that perceptual experiences can have and the type of content that beliefs and other propositional attitudes can have. According to the state view, in contrast, there need not be more than one type of content. Perceptual experiences and propositional attitudes could have contents of the same type (in both cases content could be given in terms of sets of possible worlds, for example). What distinguishes perceptions from propositional attitudes on the state view is that the latter are concept-dependent while the former are concept-independent. A state-type is concept-dependent just if it is content-bearing and it is impossible for a thinking and perceiving subject to be in a token state of that type without possessing the concepts required to specify the content of that token state. In contrast, a subject can be in states of a concept-independent state-type even if she lacks all or some of the concepts required for an accurate specification of the relevant  contents.[5]