The advantage of being in Delta is, you're asleep. (Yes, even if you're awake). Therefore, the "you" in Delta is a very different "you" that's in Beta.
I'm not sure what kind of recordings have been done, corelating brain-wave patterns with brain-activity patterns, but one of my friends took advantage of a PET scan once. While in there, she entered the "Ideal Math State" where she goes in and "SEES" the answer to a complex problem. This isn't "normal math, only faster." This is applying a deep structural understanding of the Ordering Concepts which are expressed formally through math. (Yes, I'm getting Platonic here). Long story short, her prefrontal cortex turned OFF and her limbic center turned WAY UP. The people in the lab thought she had gone into a coma, although she could still talk (which is impossible under known neurological theory).
The central point of Centerpoint (if you'll excuse the pun), is to engage the listener in aware delta-level consciousness. At this point, the listener has much LESS access to the parts of their mind which make up "ego." Because "ego" and "shadow" are a dyad which create and strengthen each other, the listener gradually reaches deeper and deeper levels of "shadowlessness."
