biofeedback bi·o·feed·back (bī'ō-fēd'bāk')
n.
A training technique that enables a person to gain some element of voluntary control over autonomic body functions. It is based on the principle that a desired response is learned when received information indicates that a specific thought or action has produced the desired response.
A training technique by which a person learns how to regulate certain body functions, such as heart rate, blood pressure, or brain wave patterns, that are normally considered to be involuntary. The person learns by watching special monitoring instruments attached to the body that record changes in these functions.
Note: Biofeedback has had some success in the treatment of such disorders as chronic headaches and back pain.