I tried Win Wenger's "image streaming" and noticed no gains. He claims you should dictate your images you see into a tape. Why? Unless you miraculously started having visions, you'll never listen to those tapes again.
I also tried his method of holding your breath as long as possible under water for 2-3 weeks. The theory being is your oxygen capacity increases. I was diligent on this one but again the results were NADA.
Ever tried his techniques in the book "Beyond OK"?