I was reading up on an article and thought it might relate well to this topic...
xepherys, you mention that the brain is only roughtly 12% used. I have read that we only use roughly that percentage at any one time, however we use most of it, just in small bursts in different places... I can't find the link at the moment though, it may be somewhere around mythbusters?
The link provided below suggests that meditating and spiritual experience is wired into our brains and I would assume that people that want to access it, can, and not just because there is a use of drugs involved... in any case it was an interesting read.
Quote:
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Although the field is brand new and the answers only tentative, one thing is clear. Spiritual experiences are so consistent across cultures, across time and across faiths, says Wulff, that it "suggest[s] a common core that is likely a reflection of structures and processes in the human brain."
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Here is the link:
http://www.cognitiveliberty.org/neuro/neuronewswk.htm