Continuing along the same lines as George, this shouldn't come as a surprise to anyone familiar with meditation or the like. It's been known for a number of years now that the altered states of consciousness meditation practitioners experience are caused by changes in brain waves and patterns.

But as many spiritual leaders and counselors will say, even though the experience of meditation and/or prayer can be profound, in the end it's meaningless. The issue is not what you experience in meditation or prayer, per se, but how that experience impacts the rest of one's life.

I believe most would distinguish between having glimpses or flashes of Enlightenment, and living an Enlightened existence. Experiencing the former in no way implies or guarantees the latter.