Parfit's division, where each hemisphere of his brain is transplanted into the skull of one of his identical triplets, shows that psychological continuity is not sufficient for numerical identity.

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Parfit's thought experiment demonstrates that even if psychological continuity is preserved through the division and transplantation of his brain hemispheres into two of his identical triplets, this scenario challenges the traditional view that such continuity is sufficient for maintaining one's numerical identity, suggesting instead that our intuitions about identity may need to be revised.

Parfit's Division, Where Each Hemisphere of His Brain Is Transplanted