satori and the brain
This is an article I found that refers to the subject of 'intra hemispherical intrusion' as a possible occurrence in sudden enlightenment experiences. I have no idea about the qualifications of the author but it's an interesting reading. I'm no science buff and I pretty much understood the gist of it. The pictures help alot. The guy seems to have a distorted view of what enlightenment is, but it could explain the experiences of people like Byron Katie and Eckhart Tolle.