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gwern comments on Inverse cryonics: one weird trick to persuade anyone to sign up for cryonics today! - Less Wrong
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There's also "Persistence of Long-Term Memory in Vitrified and Revived C. elegans", Vita-More & Barranco 2015 - so we know that in at least one species (which did not evolve for being frozen) that long-term memory is preserved by the best cryonics techniques.
Given that c. elegans survived vitrification, it's not surprising that its memory persisted, though it does underline the point that memory is not some kind of magic - it's physically recorded. Of course large mammals like humans are very different from c. elegans.
Given that
we can conclude that the skeptical case is trying to thread through an ever narrower gap. If you claim that the physical correlates of memory are too delicate, you contradict existing results. If you claim they are too robust, you are forced to conclude that they are preserved by the best cryo.