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Disjunctivism is a position in the philosophy of perception that rejects the existence of sense data in certain cases. the disjunction is between appearance and the reality behind the appearance "making itself perceptually manifest to someone." Veridical perceptions and hallucinations are not members of a common class of mental states or events. According to this Theory, the only thing common to veridical perceptions and hallucinations is that in both cases, the subject cannot tell, via introspection, whether he is having a veridical perception or not. Disjunctivists say this because they hold that in veridical perception, a subject's experience actually presents the external, mind-independent object of that perception. Further, they say that in a hallucination There is no external object to be related to, nor are There sense-data to be a part of the perception. Thus, disjunctivism is a form of co-realism.