Background:
On the most recent LessWrong readership survey, I assigned a probability of 0.30 on the cryonics question. I had previously been persuaded to sign up for cryonics by reading the sequences, but this thread and particularly this comment lowered my estimate of the chances of cryonics working considerably. Also relevant from the same thread was ciphergoth's comment:
By and large cryonics critics don't make clear exactly what part of the cryonics argument they mean to target, so it's hard to say exactly whether it covers an area of their expertise, but it's at least plausible to read them as asserting that cryopreserved people are information-theoretically dead, which is not guesswork about future technology and would fall under their area of expertise.
Based on this, I think there's a substantial chance that there's information out there that would convince me that the folks who dismiss cryonics as pseudoscience are essentially correct, that the right answer to the survey question was epsilon. I've seen what seem like convincing objections to cryonics, and it seems possible that an expanded version of those arguments, with full references and replies to pro-cryonics arguments, would convince me. Or someone could just go to the trouble of showing that a large majority of cryobiologists really do think cryopreserved people are information-theoretically dead.
However, it's not clear to me how well worth my time it is to seek out such information. It seems coming up with decisive information would be hard, especially since e.g. ciphergoth has put a lot of energy into trying to figure out what the experts think about cryonics and come away without a clear answer. And part of the reason I signed up for cryonics in the first place is because it doesn't cost me much: the largest component is the life insurance for funding, only $50 / month.
So I've decided to put a bounty on being persuaded to cancel my cryonics subscription. If no one succeeds in convincing me, it costs me nothing, and if someone does succeed in convincing me the cost is less than the cost of being signed up for cryonics for a year. And yes, I'm aware that providing one-sided financial incentives like this requires me to take the fact that I've done this into account when evaluating anti-cryonics arguments, and apply extra scrutiny to them.
Note that there are several issues that ultimately go in to whether you should sign up for cryonics (the neuroscience / evaluation of current technology, estimate of the probability of a "good" future, various philosophical issues), I anticipate the greatest chance of being persuaded from scientific arguments. In particular, I find questions about personal identity and consciousness of uploads made from preserved brains confusing, but think there are very few people in the world, if any, who are likely to have much chance of getting me un-confused about those issues. The offer is blind to the exact nature of the arguments given, but I mostly foresee being persuaded by the neuroscience arguments.
And of course, I'm happy to listen to people tell me why the anti-cryonics arguments are wrong and I should stay signed up for cryonics. There's just no prize for doing so.
To keep the information all in one place, I'll reply here.
Cryogenic preservation exists in the proof of tardigrades - also called waterbears - which can reanimate from temperatures as low as 0.15 K, and have sufficient neurophysiological complexity to enable analysis of neuronal structural damage.
We don't know if the identity of a given waterbear pre-cyrobiosis is preserved post-reanimation. For that we'd need a more complex organism. However, the waterbear is idiosyncratic in its capacity for preservation; while it proves the possibility for cyrogenic preservation exists, we ourselves do not have the traits of the waterbear that facilitate its capacity for preservation.
In the human brain, there are billions of synapses - to what neurones other neurones connect, we call the connectome: this informs who you are. According to our current theoretical and practical understanding of how memories work, if synapses degrade even the slightest amount your connectome will change dramatically, and will thus represent a different person - perhaps even a lesser human (fewer memories, etcetera).
Now, let's assume uploading becomes commonplace and you mainly care about preserving your genetic self rather than your developed self (you without most of your memories and different thought processes vs. the person you've endeavoured to become), so any synaptic degradation of subsistence brain areas becomes irrelevant. What will the computer upload? Into what kind of person will your synapses reorganise? Even assuming they will reorganise might ask too much of the hypothetical.
Ask yourself who - or what - you would like to cyropreserve; the more particular your answer, the more science needed to accommodate the possibility.
How would you design that experiment? I would think all you'd need is a better understanding of what identity is. But maybe we mean different things by identity.