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Personal Identity

Theories

The Soul Theory

Spatiotemporal Continuity Theory

Brain-Based Psychological Continuity Theory

Split Brain Cases

- *X*'s brain is split into two halves
  - Two spatiotemporally distinct individuals, *Y* and *Z*, are formed
- Is *X* the same individual as *Y*, *Z*, both, or neither?
- [Derek Parfit](/second-brain/derek%20parfit)'s response
  - Something wrong with the question
  - All that really matters for personal identity is psychological continuity

David Hume on personal identity

Philosophy Identity Metaphysics