... regulating neurotransmitter in the brain (endorphin, serotonin, and y-aminobutyric acid) secretion of anxiety in the brain back on a sound ... effective promotion of endorphins in the brain, serotonin, y-aminobutyric acid secretion, in the brain of the patient environment back ... insomnia therapeutic instrument, heart rate, blood pressure and gastric acid secretion of the human body, skin and muscle power ...