... way the person still only has half a brain. Parfit also rejects the second possibility. In the second possibility the person survives as one of the two new people. Parfit's rejection is based on both halves of the brain being identical. If both halves of the brain are identical, and both are transplanted successfully, then there is no reason for one to survive and the other not too. The third possibility is more difficult to resolve. Parfit rejects the notion of the survival as two people. If survival consists in the sameness of identity, then it doesn't follow that a person can survive in two people and have the same identity. On the other hand it may be possible for one person to have two bodies with a divided mind.3 Supposing that the two people were separated for a long enough time, it stands to reason that they ...

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