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AngryParsley comments on Cryonics and the importance of body to cognition - Less Wrong Discussion
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I agree that the state of one's body changes cognition quite a bit. Still, if someone becomes a quadriplegic or acquires locked-in syndrome, we don't consider them to be dead or a different person. And compared to extracting a mind from a cryopreserved brain, rebuilding a (simulated or real) body from memories and DNA isn't that hard.
Definitely. But some people really, really like being a body - it's a major part of who they consider themselves. Cryonics may have trouble reaching them if it doesn't address this. (Which may be minor to all the other marketing deficiencies it seems to have.)
To be fair to them, demonstrable alternatives are pretty thin on the ground.