  Those who reject the metaphysical assumption that mental events (or states) have a ‘fundamental’ kind may instead formulate their disjunctivist stance in terms of the claim that the differences between the kind of mental event that occurs when one veridically perceives the world and the kind of mental event that occurs when one hallucinates are due to differences in mental features of the events in question. The thought here is that the fact that there is a respect in which two mental events (or states) are different may not be due to the fact that they differ in some mental respect, and while we might type mental events and states in a variety of different ways, for a variety of different purposes, we can distinguish a way of classifying such events and states that focuses solely on their mental features. For example, although there may be a context in which it suits our purposes to group together the beliefs of a subject that are true, it is not generally thought that a belief’s being true is a mental feature of that state.