If you have not yet seen this video, you must. Jill Bolte Taylor is a neuroanatomist. She got the chance to be her own research subject when a stroke robbed her of left brain function. In this lecture she describes her experience and the epiphanies that came with it.
I was reminded of this video, recently, when I happened to catch this interview with neuroscientist Michael Gazzaniga on NPR's "Fresh Air." Gazzaniga has done extensive research with split brain patients, such as epileptics who've had the connection between hemispheres surgically severed to prevent seizures.
Both discuss, in different ways, the role of the brain in spiritual awareness and religion. I highly recommend laying a little time aside to give both of these presentations a listen. The NPR interview has audio available here.