Is this one life all there really is?
All the evidence says that it is. Despite hocus pocus claims from preachers and urban legends about people who have been to heaven and come back, there's no evidence that life goes on after death. Consciousness is dependent on physical processes. When the brain dies and the body decays, there is no longer an organized physical process, so the only logical conclusion is that there is no consciousness.
But what about near death experiences? Couldn't they be proof of an afterlife? Let's examine the evidence. All the stories are just that – stories. Anecdotal evidence, as we've seen, is extremely weak, and should only be considered when stronger corroborating evidence exists. Were the people who experienced NDEs in good mental and physical condition? Obviously not, as near death is a pretty bad situation, both physically and mentally. We know that even minute changes in the brain can trigger wildly erratic perceptions and behaviors. Dying is considerably more than a minute change in the brain. On the surface, the evidence for NDE's as proof of an afterlife seems fragile at best.
We're still not done, though. Is there better evidence that NDE's are simply physical, and that the perceptions of heaven and hell are illusions? It turns out that there is quite a lot. Before discussing NDEs directly, we need to be clear on a few terms.
If you've ever watched the movie, The Princess Bride, you will remember Miracle Max's famous words about death: “Whoo-hoo-hoo, look who knows so much. It just so happens that your friend here is only MOSTLY dead. There's a big difference between mostly dead and all dead. Mostly dead is slightly alive. With all dead, well, with all dead there's usually only one thing you can do. Go through his clothes and look for loose change.” The scientific descriptions are not as witty, but they're not radically different. There is a big difference between clinical death and brain death. Clinical death usually results from cardiac arrest. When the heart stops pumping, neurons no longer receive oxygen. Without new oxygen, they continue to fire for a short while, sometimes with odd side effects. It would only be a slight stretch to say that a clinically dead person is mostly dead.
Brain death, on the other hand, is all dead. Clinical death can be reversed within a certain time frame. We've all heard stories, and seen depictions on medical dramas. The heart can be started chemically, electrically, and manually, depending on the situation. Assuming that there is still some neural activity, starting a clinically dead person's heart will bring them “back to life.” Not so with brain death. Once the brain dies, the person is fully dead, and will not come back.
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