# More Info — Causation, Information, Identity, and Becoming Part 03 of 5 (1,684 words) PART IV. Personal Identity ==================================================================================================== ---------------------------------------------------------------------------------------------------- 17. Identity as the continuity of one’s own mind ---------------------------------------------------------------------------------------------------- A natural criterion of personal identity is the continuity of the individual’s own mind. This is stronger and more precise than requiring the same body, atoms, or physical configuration, all of which change over a lifetime: molecules are replaced, appearance changes, neural configuration shifts from moment to moment, and memories are formed and lost. The relevant continuity is continuity of the mind as an ongoing process, which makes identity fundamentally diachronic rather than configurational. A snapshot of a person at 10:00 and another at 20:00 can be different physical configurations while belonging to the same continuing individual. “Mind” must mean more than the mental contents present at a given moment; otherwise sleep, anesthesia, unconsciousness, or memory loss would seem to create a new person. A more robust formulation is: Personal identity consists in the continuity of one’s own mind as an ongoing causal and psychological process, rather than in the persistence of any particular material configuration. Memory is a central component of that continuity because it carries much of a person’s accumulated history: experiences, relationships, knowledge, commitments, preferences, beliefs, decisions, and self-understanding. Memory is nonetheless not everything. A person can temporarily lack access to memories without becoming numerically different, and losing a memory does not make the remembered event cease to have happened or cease to have been part of that person’s history. What changes is present access to part of that history. The view therefore has three interconnected layers: • Mind continuity: the continuing individual mental process. • Memory continuity: preservation of, and access to, much of the individual’s accumulated history. • Causal continuity: the actual chain connecting earlier states of that mind to later ones. ---------------------------------------------------------------------------------------------------- 18. Identity under presentism ---------------------------------------------------------------------------------------------------- Under CTGP only the present exists, so the claim “I am the same person I was ten years ago” relates something that exists (the present person) to something that does not (the earlier person). The same resources that answer the general question about past truths answer this one. That the present person was the earlier person is grounded in the present world’s past-tensed properties; the person is the present stage of a process whose history is also physically written into it now, as memory, neural structure, habits, dispositions, and commitments. Memory is evidence of this continuity, not what creates it. A present brain is not merely a container of information about its past; it is one of the physical consequences produced by that past. The resulting self-description is not “I am the person who remembers being me” but rather “I am the presently existing continuation produced through the causal development of that earlier individual.” ---------------------------------------------------------------------------------------------------- 19. Three kinds of continuity ---------------------------------------------------------------------------------------------------- Three different continuities are easily run together: • Physical continuity: a physical system continuously develops into its next state. • Informational continuity: information about previous states remains encoded. • Experiential continuity: successive conscious states belong to one stream of experience. These can come apart. A hard drive can preserve informational continuity without experiential continuity; a sleeping person can have reduced conscious activity while preserving physical and informational continuity; and a perfect duplicate could share information and conscious organization while still raising the question of numerical identity. CTGP’s extension to consciousness treats causal continuity as one necessary condition for qualia-capable processes, while explicitly not claiming to solve the hard problem of consciousness. In ordinary life the three continuities coincide, which is why their distinctness is rarely noticed: persistence of organization ≠ persistence of information ≠ persistence of experience ---------------------------------------------------------------------------------------------------- 20. Duplication: same information is not the same individual ---------------------------------------------------------------------------------------------------- Imagine a technology that produces a second human with the same genome, brain structure, synaptic strengths, relevant molecular states, memories, and personality. The duplicate wakes sincerely believing “I am me, and I remember everything that happened.” There are now two physically distinct causal continuations. A copied memory can preserve information about someone’s history without transferring that person’s numerical identity: same information ≠ same history ≠ same individual A history can be copied without the historical individual being copied. More precisely, a person’s present state can be reproduced without the history that produced it being reproduced as the same history. The duplicate is not thereby “fake.” It would be a fully real conscious individual whose present state happens to encode another person’s history. Care is needed about why the copy differs, because the copy’s memories are not causally disconnected from the original events. The duplicate’s causal chain runs past event → original brain → scan → construction → duplicate’s memory. Both chains are causal and both reach back to the event; what differs is the route. One stays inside a continuously living organism; the other passes through measurement, encoding, and reconstruction. Causal ancestry alone therefore does not settle identity. A child is causally descended from a parent without being the parent, and a duplicate causally descended from a brain state is not, by that fact alone, the person whose brain it was. Causal dependence explains why something exists and how it arose; it does not by itself say whether the result is the same thing as its cause. An identity criterion must specify which kinds of causal pathway constitute continuation of an individual rather than production of a new one. ---------------------------------------------------------------------------------------------------- 21. Branching shows that psychological continuity is not enough ---------------------------------------------------------------------------------------------------- Suppose one person becomes two successors, each with the same memories, personality, and causal ancestry up to the branching point. If psychological continuity were sufficient for identity, each successor would be the original. But numerical identity is transitive: if A = B and A = C, then B = C, and B and C are plainly two people. Therefore whatever relation preserves personal identity cannot be unrestricted psychological continuity. This is the fission problem familiar from Derek Parfit’s work, and it shows something structural: a relation can preserve everything that matters psychologically while failing to preserve numerical identity. The literary fiction work confronts this directly. In its fictional universe, a single continuing existence can transition between different forms without being duplicated; non-duplication is a world rule. That rule does real metaphysical work. It answers a question that psychological continuity alone leaves open, namely what happens when continuity branches. In the actual world nothing in known physics forbids branching in principle, so a real-world continuity view needs an explicit non-branching condition or an alternative criterion. Presentism sharpens the problem in an instructive way. After a split, both successors carry identical records of the pre-split history, and records can be copied. Under CTGP the fact of which successor walked out of the scanner and which out of the printer is still grounded, because it belongs to the present world’s past-tensed profile. What can be lost is access: if every distinguishing record is duplicated or erased, the fact may become unrecoverable. The duplication case is thus a clean example of a fact that exists without being accessible to the observers it most concerns. ---------------------------------------------------------------------------------------------------- 22. Transformation versus reconstruction ---------------------------------------------------------------------------------------------------- Continuity of activity and continuity of identity are not the same thing. Temporary inactivity is not necessarily discontinuity: during sleep, general anesthesia, or the deep hypothermic circulatory arrest used in some surgery, during which the brain’s electrical activity can fall silent, the brain’s organized physical structure remains intact, and later activity is causally continuous with earlier activity through that persisting structure. “Uninterrupted electrical activity” therefore cannot be the criterion. Ordinary biological replacement preserves an ongoing causal organization: the existing organization participates in determining how its own components are replaced, and at no stage does the person’s complete state exist merely as information outside the person. Scan-and-rebuild procedures differ in kind, because they insert a representation as an intermediate step. The original is measured, its state is encoded, and another system is built from the encoding. If City A were converted into a map and City B were then built from the map, no one would say that City A had traveled to B; something informationally derived from A produced B. The same applies to persons: the information required to reconstruct someone can survive without the individual whose information it is. Past → present through causal continuity: transformation. Past → representation → new instantiation: reconstruction. One candidate criterion is therefore: Personal identity consists in the uninterrupted causal inheritance of an embodied organization, rather than in reconstruction from a representation. Applied consistently, it yields the following verdicts: • Sleep, general anesthesia, and temporary cessation of detectable brain activity with structure intact: continuity. • Gradual biological replacement incorporated into the existing organization: continuity. • Gradual synthetic replacement incorporated in the same way: plausibly continuity, for the same reason. • Scan, destruction of the original, and reconstruction elsewhere: discontinuity, meaning the death of the original and the creation of a new person. Many people find this conclusion hard to accept, and it is the crux of Parfit’s teletransporter case. • Scan and reconstruction while the original survives: two individuals, not one becoming the other. • A perfect copy made from stored information: a new individual, however psychologically identical. • The Ship of Theseus repaired plank by plank: plausibly the same ship, since the existing organization continuously transforms rather than being rebuilt from a blueprint. The criterion is not without difficulty. Consider neurons replaced one at a time by functional equivalents until none of the originals remains. On a continuity reading, each replacement is incorporated into an already existing organization. On a “micro-reconstruction” reading, each replacement destroys one component and creates a successor from a description of it. Nothing in the physical process announces which reading is correct. Between gradual molecular turnover and whole-brain scan-and-rebuild lies a spectrum, and candidate dividing features include locality, temporal continuity, preservation of causal organization, the absence of an informational bottleneck, the absence of branching, or some combination. The framework has not established which of these is decisive; what it has done is locate the precise unresolved variable. Whatever criterion is chosen will settle the teleporter, the printer, gradual replacement, mind uploading, and the Ship of Theseus at once. ----------------------------------------------------------------------------------------------------