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The Soul Theory suggests that personal identity is defined by the existence of an immaterial soul that remains constant through time.

The Body Theory posits that personal identity is tied directly to the physical body and its continuity over time.

The Brain Theory of personal identity claims that continuity of one's identity is contingent upon the continuity of one's brain and its functions.

Locke's Memory Theory suggests that personal identity is based on a person's memory continuity; one's identity is as far as their memory reaches.

This paradox questions whether a person who is teletransported and exactly replicated elsewhere remains the same person, challenging the criteria for personal identity.

This theory claims that personal identity is constituted by the psychological characteristics and memories that are coherent and connected over time.

Parfit's Reductionism breaks down personal identity into a series of connected psychological events, rejecting the theory of a constant self.

Animalism is the view that personal identity is based on our identity as biological organisms; our persistence is the persistence of our animal body.

Narrativity proposes that personal identity is constructed through the narrative we create about ourselves, integrating experiences into a coherent story.

The Bundle Theory suggests that the self is a collection of perceptions, thoughts, and experiences, without a constant underlying entity.

The No-self Theory, particularly in Buddhism, claims that there is no inherent, permanent self or soul, and personal identity is a convenient fiction.

Multiple Selves Theories suggest that each person contains a variety of overlapping selves that surface in different contexts, questioning a singular identity.

In Emergentism, personal identity is seen as a complex emergent property arising from physical and psychological processes, not reducable to simpler elements.

The indeterminacy in Quantum Mechanics may imply that personal identity is not fixed, with potential for multiple realities or parallel existences.

Extended Mind Theory suggests that components of our identity can reside outside of our bodies, in the tools and technologies we integrate with.

Moral Agency Theory posits that identity is tied to our capacity for moral agency, which includes the ability to make ethical decisions and understand our actions.

Altering memories can potentially change the narrative of a person's identity, challenging the concept of authenticity and continuity in self-perception.