Final answer:
Biofeedback is the process of learning voluntary control over autonomic body functions using specialized equipment. It has been successful in treating tension headaches, high blood pressure, asthma, and phobias.
Step-by-step explanation:
The process of learning voluntary control over largely autonomic body functions such as heart rate, blood pressure, and muscle tension by using specialized, sensitive equipment to control pain is called Biofeedback. Biofeedback is a technique that uses electronic equipment to measure a person's neuromuscular autonomic activity and provides feedback in the form of visual or auditory signals. It has been successful in helping individuals with tension headaches, high blood pressure, asthma, and phobias.