Biofeedback is the process of measuring and quantifying an aspect of a subject’s physiology, analyzing the data, and then feeding back the information to the subject in a form that allows the subject to enact physiological change.
Biofeedback gives a person immediate information about his or her otherwise unconscious bodily processes. In a sense, biofeedback is an attempt to allow the higher levels of the brain to micro-manage systems that are usually left to themselves.