Parfit's reductionism in Reasons and Persons entails personal identity supervenes on physical and psychological continuity, making gametic origin merely one contributor among several individuating factors.
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The unbroken chains of bodily changes (like your body aging) and mental changes (like your memories, personality, and beliefs) that connect your past self to your present self.
Reasons and Persons(as the source text)
A landmark 1984 philosophy book by Derek Parfit that explores how we should live and make decisions, especially when our personal interests conflict with what's best for everyone.
Reductionism (in philosophy of personal identity)(describing Parfit's main philosophical position)
The view that personal identity isn't some deep, mysterious fact, but can be completely explained by breaking it down into simpler physical and psychological facts about continuity and connection.
personal identity(Philosophy of personal identity)
The relation of sameness holding between a person existing at one time and something existing at another time, analyzed here in terms of psychological continuity
supervenes on(as used in metaphysics and philosophy of language)
Depends entirely on or is completely determined by something else—like how a painting's beauty supervenes on the colors and brushstrokes, meaning you can't change the beauty without changing those physical facts.