 In one of the most influential discussions of personal identity Derek Parfit defends a view close to Nozick's by distinguishing between survival and identity (in Perry 1975). In Nozick's view what psychological continuity guarantees is not identity, but survival. In the case where both of A's hemispheres are transplanted to yield PB and PC, A survives as PB, and survives as PC, though she is identical with neither PB nor PC.