jts wrote:There are lots of psychological theories about why people cry when others die. Obviously there are lots of feelings of powerlessness, deprivation, and guilt floating around. But that doesn't mean that we never want anyone to die. Quite to the contrary, a great deal of grief might be a nervous reaction to thinking that the time had come for someone to die.
"the time had come for someone to die"-- Barring tragedy, aging, illness, etc., (all likely to be nonexistent or very rare in a future capable of waking the frozen), I can't think of any reason why such a time should come for anyone.
jts wrote:I never like to do the dishes. I would always rather do the dishes in an hour rather than right now. So logically, what I would like most of all is to have all of my dishes be dirty all the time.
I don't think that follows at all. When your desire to not appear to be a slob overcomes your laziness, you'll do the dishes.
jts wrote:All it takes is a passing acquaintance with the history of Christian ideology to learn that we are very far from the first generation to hope to triumph over death.
Trying not to make this a religious conversation:
jts wrote:What would have to be true to convince you that the person revived by cryogenics was you, and not a wholly new person?
Honestly, I think this is the first non-trivial objection, in that there are several logical steps needed.
1. Consciousness (personality, memories, etc) is entirely produced/stored in the brain (mainly and most importantly in the neural connections).
2. Disruptions to the brain smaller than those of thermal noise do not harm this information.
3. Cryogenic freezing preserves the neural connections.
I give #1 and #2 both a > 99% chance of being correct. #3 I'll give > 90% chance*.
I can expand if desired. Basically, if you agree that the "you" of today is the same as the "you" that went to bed last night, this objection goes away-- a well done cryogenic revival should cause on the order of that much change to your brain*. (If you think those "you"'s are different, well, then you're already used to being different people anyway and it shouldn't bother you!)
[*] No comment on the death process, which may be more or less hard on your brain depending on how exactly it happens. Though I will say that it appears that in oxygen deprived brain damage, most of the brain damage occurs when oxygen is restored to the brain, not when it is first withheld.
jts wrote:What percentage of their memories would have to be the same? What percentage of their personality? What percentage of their body?
Memories and personality go along with the brain. The rest of the body is less important; in theory it (or a close enough substitute) could be created given my DNA.
BTW, I don't think being "me" is a binary distinction. A being sharing 90% of my brain layout I would consider 90% me, and I expect cryonics to do significantly better than that if it works at all. All humans share the same general layout, but it's the exact specifics that make the difference.
jts wrote:Does the new you have to have the same friends, relatives, lovers, hobbies?
I'm not sure this makes sense. If you lose/gain a friend, does that make you a different person? I would say: not in the way I think we're talking about.
jts wrote:The same sensory perceptions?
I'm not sure what you mean by this.
jts wrote:what would convince you that a person kept alive for hundreds of years with exotic medical technology was you, and not a wholly new person?
Shared history with my current brain. Note that there's no need to add in the medical technology to get this paradox! I'm very different than I was 10 years ago, and I consider the differences improvements (growth). I imagine the me of 100 years from now will be quite different from the current me, and will consider those differences the same way. As long as you can draw a line through time and space connecting the informational content of our brains*, we will be the "same" person.
[*] So, (accurate) digital representations running under emulation would still be "me".
jts wrote:What would convince you that a human being born at a different time from you was a wholly new person, and not you?
Lack of shared history with my current brain. Time and distance are effectively the same thing for this question: how do you know you're not Britney Spears?