Self Transcendence

"Support for a neuropsychological model of spirituality in persons with traumatic brain injury" suggests that spiritual experiences are related to increased physiological activity of the frontal and temporal lobes and decreased activity of the right parietal lobe.

And similarly,
"The Spiritual Brain: Selective Cortical Lesions Modulate Human Self-Transcendence" finds that selective damage to left and right inferior posterior parietal regions induced a specific increase of self-transcendence.

And all that reminds me of "Religious and Mystical States:A Neuropsychological Substrate," some highlights on Andy Newberg's website, which describes more activation in frontal lobes and lower activation in the parietal lobes (where the sense of space and time are manufactured).

So overall, decreased activity (lower beta, higher alpha) in the parietal area seems to be important.