Tami Simon speaks with Dr. Jeffrey Thompson, one of the foremost researchers studying sound and its effect on the brain and body. Based on his discoveries of how specific frequency patterns can create health benefits, Dr. Thompson has created dozens of popular brainwave entrainment audio programs, including Brainwave Suite, Alpha Relaxation System, and Delta Sleep System. In this episode, Tami speaks with Dr. Thompson about the science behind brainwave entrainment and how it can affect our physiology, the discovery of the gamma brainwave state that occurs during periods of deep meditation, and the power of what Dr. Thompson calls primordial sounds. (75 minutes)