This sound therapy is aimed at providing sound frequency regulation for the middle portion of our brain, known as the limbic system. This is the part of the brain which stores and processes our emotions, and regulates certain basic responses like appetite and desire for sleep as well as other autonomic functions. Unlike other parts of the brain, the limbic system can become imbalanced if its capacities for regulation are impaired or even suspended. As a result, we can experience are emotional reactions that are excessive, unmotivated or wrongly motivated. Cost is $23 plus shipping.