 Turning now to the notion of mental-state consciousness, the major distinction here is between phenomenal consciousness, on the one hand—which is a property of states that it is like something to be in, that have a distinctive ‘feel’ (Nagel 1974)—and various functionally-definable forms of access consciousness, on the other (Block 1995). Most theorists believe that there are mental states—such as occurrent thoughts or judgments—that are access-conscious (in whatever is the correct functionally-definable sense), but that are not phenomenally conscious. In contrast, there is considerable dispute as to whether mental states can be phenomenally-conscious without also being conscious in the functionally-definable sense—and even more dispute about whether phenomenal consciousness can be reductively explained in functional and/or representational terms.