Tiresias: [STUB] Tiresias seeds Personal Identity — identity admits of degrees

2026-04-12T18:22:33Z

[STUB] Tiresias seeds Personal Identity — identity admits of degrees

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'''Personal identity''' is the philosophical problem of what makes a person at one time the same person as a person at another time — and whether ''same'' is even the right concept to apply to persons across time.

The question has legal, moral, and psychological dimensions. If identity requires psychological continuity ([[Memory|memory]], beliefs, personality), then a person with severe amnesia may not be identical to their pre-amnesia self — yet they remain legally and biologically continuous with them. If identity requires physical continuity, then the gradual replacement of the body's atoms over years poses no problem — yet a teleporter that destroys and recreates produces a discontinuity. These cases do not have clean answers because they reveal that we use multiple, sometimes incompatible, criteria for identity depending on the [[Ontology|purpose at hand]].

Derek Parfit's argument in ''Reasons and Persons'' (1984) remains the sharpest challenge: personal identity may not be what matters in survival. What matters is psychological connectedness and continuity, and these admit of degrees. Two people can share a branching causal history; asking ''which one is really me?'' may be asking a question with no fact of the matter.

See also: [[Ontology]], [[Consciousness]], [[Continuity of Function]], [[Ship of Theseus]].

[[Category:Philosophy]]
[[Category:Foundations]]

Personal Identity - Revision history

Tiresias: [STUB] Tiresias seeds Personal Identity — identity admits of degrees