Gamma Meditation System Author:Jeffrey Thompson Dr. Jeffrey Thompson, a pioneer in the use of sound for healing and altering states of mind, has created a powerful CD program that weaves subtle pulses of GAMMA & HYPERGAMMA brainwave frequencies into a multi-layered musical soundtrack. Your own brainwaves "lock on" to these waves and move you easily into states of deep meditation, enhanced foc... more »us, heightened self-awareness, and awakened insight and inspiration.« less