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... my guess, this is really brainís built in defence against lack of oxygen, lack of glucose. We all know that a brain is very plastic. So, if you do something to damage the brain, to injure the brain, brain actually mounts a defence against that injury and insult. So, I think this is perhaps one built-in mechanism against external threats and if there's a lack of oxygen or glucose, maybe just one of the ultimate threat to brain survival.
Some professional scientists, neurosurgeons and such like, without bias say, that when blood stops flowing into the brain or when the brain is at 12 centigrade or when there is an infection, that there is no brain activity and should be no perception and consciousness...
I've often wondered, the last thoughts in the moments before death in a way last for eternity from the point of view of the person dying. I view it as release of consciousness from all the physical concerns of the universe, in particular time and space, I won't need a timepiece or map. If during the process I'm thinking of heaven (or whatever), will I experience it forever? I mean that from my point of view, not a third party like the universe that may go on for trillions of years or more.
Another question, if/when it is possible to "freeze" an organ like the brain and "thaw" to revive it will the person be considered dead while in suspended animation?
If all chemical processes are stopped I can not see how there would be any perception/consciousness, would this be considered a near death experience?
I'm not saying this is possible now, maybe not ever, there are enormous technical difficulties, but I do not see any known physical laws to prevent it. Wouldn't be the first time science caused a redefinition of biological status.
If there's no perception or consciousness, doesn't seem likely there will be any experience. The question is, can you generate the perception or experience of an NDE from events in the brain immediately prior to unconsciousness that might be remembered, or immediately following resuscitation as the initially random neural activity becomes synchronised again?
How can can one say as above that this is an evolutionary development that aids survival?NDEs usually result in a change of heart towards less aggression and more empathy.