Biofeedback (noun)

1. A technique in which an individual is provided with information about their physiological processes, such as brain waves or muscle tension, in order to gain control over them.
2. A method of training in which an individual can learn to control certain physiological functions by receiving visual or auditory feedback about these functions.

Origin:

1970s: from bio- "life" + feedback.

Examples:

1. The patient was trained in biofeedback to control her blood pressure.
2. The patient used biofeedback to reduce her stress level.
3. Biofeedback is used to treat a variety of conditions such as chronic pain, headaches and hypertension.
4. The biofeedback machine measured the patient's brain waves.
5. The biofeedback session showed the patient how to control her muscle tension.