Here's a talk by a brain scientist who describes the experience of having a stroke which led to a mystical experience of the One-ness... it gives a fascinating perspective.
As a result of seeing this I'm finding focusing on my physical right brain to be of assistance in calming mental chatter!
Jill Bolte Taylor: My Stroke of Insight
So who are we? We are the life force power of the universe, with manual dexterity and two cognitive minds. And we have the power to choose, moment by moment, who and how we want to be in the world. Right here right now, I can step into the consciousness of my right hemisphere where we are -- I am -- the life force power of the universe, and the life force power of the 50 trillion beautiful molecular geniuses that make up my form. At one with all that is. Or I can choose to step into the consciousness of my left hemisphere. where I become a single individual, a solid, separate from the flow, separate from you. I am Dr. Jill Bolte Taylor, intellectual, neuroanatomist. These are the "we" inside of me.
Which would you choose? Which do you choose? And when? I believe that the more time we spend choosing to run the deep inner peace circuitry of our right hemispheres, the more peace we will project into the world and the more peaceful our planet will be. And I thought that was an idea worth spreading.