 There are a number of ways that defenders of a psychological continuity criterion have attempted to evade this result. One, adopted by David Lewis, goes like this (Lewis 1976). We say that earlier, when A is around with an intact brain, there are two indiscernible individuals, PB and PC, sharing a single body. Another, advocated by Robert Nozick, concedes that if both hemispheres are successfully transplanted, neither of the later individuals with just one brain hemisphere is identical with the earlier one with an intact brain, but insist that if only one hemisphere is transplanted, the resulting individual is identical with the former possessor of two hemispheres. On this view whether, for example, PB is identical with the earlier person with A's body depends on whether there is an equally good later candidate, such as PC, for being the earlier A-body person (Nozick 1981).