timtofly said:
How does one think the brain can survive after death?
If anything, what does survive after death?
The brain doesn't survive after death. Nor does any other part of our body. However, genes do. As long as you have a living relative on this earth a small part of you continues. And since all humans are related to eachother if you go back far enough, then it could be reasonably argued that part of me will live on as long as there is another living human.
For that matter, every single cell I was born with is already dead. Those cells died within my first post-partum decade. The material that currently makes up my body has been recycled through the biosphere several billion times before it came to rest with me. But it's not really accurate to say 'rest', since it will leave my body in a matter of years.
Being alive is not like a stone sculpture that only changes as the rains erode it, particle by particle, year upon year, until it's a shadow of it's original self. Being alive is a continual process of recycling of molecules and matter. We're a pattern of matter, not a static thing. When we die the pattern ceases to propagate. Nothing more.
When we die the brain ceases to function, the kidneys stop, the lymph nodes stop - it all stops. Nothing more. There is nothing of the living pattern after that final stop.
Unless you consider the genetic legacy we all hold, and some of us pass on. But even the pattern of those of us who don't pass it on continues to propagate in the bodies of those to whom we are related. Which brings me back to my first point. Circle of life, get it? ;-)