biofeedback is a topic covered in the Taber's Medical Dictionary.

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[bio- + feedback]
A training program to develop one's ability to control the autonomic (involuntary) nervous system. After learning the technique, the patient may be able to control heart rate, blood pressure, and skin temperature or to relax certain muscles. The patient learns by using monitoring devices that sound a tone when changes in pulse, blood pressure, brain waves, and muscle contractions occur. Then the patient attempts to reproduce the conditions that caused the desired changes.

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