This Is What Happens To The Brain During A Spiritual Experience
http://www.businessinsider.com/the-brain-during-a-spritual-experience-2014-6
As to whats going on in their brains, Newberg says, It depends to some degree on what the practice is. Practices that involve concentrating on something over and over again, either through prayer or a mantra-based meditation, tend to activate the frontal lobes, the areas chiefly responsible for directing attention, modulating behavior, and expressing language.
In contrast, when practitioners surrender their will, such as when they speak in tongues or function as a medium, activity decreases in their frontal lobes and increases in their thalamus, the tiny brain structure that regulates the flow of incoming sensory information to many parts of the brain.
This suggests that their speech is being generated from someplace other than the normal speech centers.
Believers could say this proves that another entity is speaking through the practitioner, while nonbelievers would look for a neurological explanation.
Newberg takes into account both perspectives. When he defines neurotheology in his book, Principles of Neurotheology, he writes, An ardent atheist, who refuses to accept any aspect of religion as possibly correct or useful, or a devout religious person, who refuses to accept science as providing any value regarding knowledge of the world, would most likely not be considered a neurotheologian.
Read more:
http://www.theatlantic.com/health/archive/2014/06/what-happens-to-brains-during-spiritual-experiences/361882/#ixzz33r0UbfYO