I few days ago I was working through the Divination Course material and came to the exercise where EA leads one through a guided meditation leading up to and into the Theta Gamma Synch (TGS).
As I followed the instructions the basics of relaxation and visualization and non-attachment were used, which were familiar. What was different was the use of the physical sense of sight as a method for measuring the mental and physiological state. I think this is a great innovation.
What I noticed was many lines of light flashing in the air. I also felt a loss of equilibrium as my state deepened.
Further, I noticed that as I maintained the TGS while watching EA talk on the video, I saw the screen flash in and out as if EA was there in 3D, popping in and out of the screen.
I found controlled breathing crucial to maintaining the state for me.