Summary |
Theories of personal identity are, most often, theories of what makes X, a person, at one time numerically identical to Y at another time. Such theories fall into two very general categories. On reductionist views, the facts about identity across time simply consist in facts about brains, bodies, or interrelated physical or mental events. On nonreductionist views, the facts about identity do not consist simply in such facts, but also consist in facts about, e.g., souls or Cartesian egos. Among reductionist theories, there are two general approaches: psychological and biological. On psychological approaches, what makes X and Y identical is typically continuity of some subset of psychological features. On biological approaches, what makes X and Y identical is typically continuity of the person's biological (animal) organism. |