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Old 01-27-2018, 04:28 PM
SamuelA is offline
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Quote:
Originally Posted by RaftPeople View Post
We do it for embryos today, but the brain is on a much larger scale, so from a cell preservation perspective, it seems to work.

So it sounds like you feel that cell preservation alone would not be enough. That the electro-chemical soup they reside in needs to be preserved also?

That seems accurate to preserve exact point in time state, but to preserve general state (e.g. personality), it's possible that could be re-created/re-balanced due to the state of the cells that naturally maintain those things. Kind of like waking up in the morning but it might take 5 days of waking up for the system to get back in harmony (maybe).
You know how you can actually do quite a lot of things to someone's brain, and if they go on living, they do have about the same memories and personality. You can shut it all down with anesthetics. Cut the blood supply and use cold water as blood. Throw all kinds of drugs that have a profound effect on specific neurotransmitters. Destroy whole sections. And for the most part, most of their memories and personality stay the same, and people can, within limits, even compensate for missing portions.

So I think this evidence indicates that the synaptic weights (you measure them by simply counting how many receivers are on the receptor cell and what state they are in) and wiring topology is probably all you actually need. The "soup", the myelination states, etc is probably all temporary. Like starting up a computer system again where you've cleared the RAM, but the hard disk is the same, and this computer system is very robust where you can scramble a random 30% of the bits on the hard disk and it will still run the same as before.

You would physically do this count by tagging the receptors with a molecule that will be visible on an electron microscope and is specific to the type of tag. So your reconstruction only needs to recognize the rough shapes of the actual axons and the probable destinations (for the topology) and there's a strength estimate by counting the amount of tags of a particular type at a synapse. Probably all the rest of the information doesn't even matter.

And even if it isn't, that doesn't matter. Minds are about change. If you can get even sorta close, I think a person could re-learn everything, much like post-stroke someone can re-learn basic tasks. Except if their brain is no longer squishy, inaccurate flesh, but is neural weights in a very large and very fast and accurate computer, it would be like re-learning everything when you have an IQ of 300.

Last edited by SamuelA; 01-27-2018 at 04:33 PM.