I had a severe concussion, and 3 1/2 years after the concussion I was introduced to E4L. Since I already had an understanding of quantum dynamics, the E4L system made sense to me, especially the brain holograms. When I started E4L, I had a list of post concussion symptoms and within 6 treatments my neck pain was gone. Within 12 treatments, almost 100% of the symptoms had dissipated.