Biofeedback is a form of alternative medicine that involves measuring a subject's quantifiable bodily functions such as blood pressure, heart rate, skin temperature, sweat gland activity, and muscle tension, conveying the information to the patient in real-time. This raises the patient's awareness and conscious control of their unconscious physiological activities.

By providing the user access to physiological information about which he or she is generally unaware, biofeedback allows users to gain control of physical processes previously considered an automatic response of the autonomous nervous system. Interest in biofeedback has waxed and waned since its inception in the 1960s; it is, however, undergoing something of a renaissance during the early 21st century, which some experts attribute to the general rise in interest about all alternative medicine modalities. Neurofeedback, a type of biofeedback treatment, has also become a popular treatment for Attention Deficit/Hyperactivity Disorder. Electromyogram biofeedback, used for muscle tension, has been widely studied and is currently accepted as a treatment for incontinence disorders, and small biofeedback machines are becoming available for a variety of uses in the home. The role of biofeedback in controlling hypertension is also becoming recognized.

The Association for Applied Psychophysiology and Biofeedback, or AAPB is the non-profit scientific and professional society for biofeedback, much akin to the American Psychological Association.

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