  As we’ve seen, the issue of how precisely to formulate a distinctively disjunctivist commitment is not uncontroversial.  For now we can at least say that the minimal commitment of a view that can be labelled a disjunctivist theory of perception is that veridical perceptions and hallucinations differ mentally in some significant respect—i.e., there are certain mental features that veridical perceptions have that hallucinations cannot have. So we can mark some of the differences between views that fall under the disjunctivist label by invoking the notion of ‘disjunctivism about X’, where X is the relevant mental feature that it is claimed differs in cases of veridical perception and hallucination. This procedure is adopted in the following two sections. If the disjunctivist about X makes the additional claim that the particular mental feature, X, that is unique to the case of veridical perception is essential to the fundamental kind of mental event it is, then they will also be a fundamental kind disjunctivist. Furthermore, if they deny that there is a common mental element to veridical perception and hallucination they will satisfy the ‘no-common-mental-element’ formulation of disjunctivism.