I believe that people experience a phenomenon which they call a NDE or OBE. I believe, based on what science has taught me about the world around me, that what is happening can be explained by processes of the brain. Basically, these experiences are akin to dreams.
In order to change my mind, I would require proof. For example, we could do an experiment, with proper controls, where, say, I write a word on a poster board in my house, then you do your OBE thing from your house and bring your spirit form to my house to read what I wrote.
I agree. The only large-scale, well-controlled study into NDE/OBEs that I know of, the
AWARE (AWAreness during REsuscitation) study, sponsored by the University of Southampton in the UK in 2008, involving 2060 patients undergoing cardiac resuscitation in 15 hospitals in the United Kingdom, United States and Austria, put signs & objects in places out of direct sight (high shelves, etc), and took detailed accounts of patient experiences.
They kept postponing publication of their results until this year, when they published in the journal
Resuscitation. They had 9% reported NDEs reported, but none of the hidden indicators were seen. They had only one (1) verifiable instance of someone reporting visual awareness of what had happened during resuscitation, and concluded, "
conscious awareness may occur beyond the first 20–30 s after cardiac arrest (when some residual brain electrical activity may occur)". Bear in mind, these patients were in cardiac units, so CPR would be going on during cardiac arrest, maintaining sufficient blood flow to the brain for survival.
In other words, a large scale study specifically designed to investigate NDE/OBEs, found nothing that could not be explained by conventional means. It doesn't prove paranormal NDEs can't happen - that can't be done; but given the lack of physical basis, and the contradiction of known physics; given that over 70 years of sophisticated neuroscience is entirely consistent with consciousness arising from the brain alone, and has found no indication of any unexpected external influence; given that similar experiences can be artificially induced, given that we know the human tendencies for confirmation bias, unreliability of memory, elaboration, confabulation, etc.; a reasonable person would surely conclude that there is currently no justification for invoking the paranormal.
ETA: I've always wondered what the (invisible) supposed wandering spirit uses for eyes, and if it can see perfectly well without physical eyes, why we have physical eyes at all... Just sayin'.