  One exegetical complication is that Levine himself now denies P1, while continuing to maintain the existence of the explanatory gap on the basis of an argument related to Argument D, although somewhat more complicated (2001, Ch. 3). And in any case, just like the inverted spectrum argument against behaviorism, functionalism and physicalism (see subsection 3.1 above), inverted spectrum scenarios are not playing an essential role in the case for the gap, and indeed Levine 2001 leans more heavily on “absent qualia” scenarios: “The conceivability of zombies…is the principal manifestation of the explanatory gap” (79).