What is the main assumption behind biofeedback as a stress reduction technique?

1. Biofeedback was developed by Gary Schwartz at Harvard University in the early 1970s. 2. It uses electronic equipment to measure a person's neuromuscular and autonomic activity, feeding the readings back as visual or auditory signals. 3. The main assumption is that giving somebody biofeedback lets them develop strategies to gain some voluntary control over normally involuntary bodily processes. 4. Measures used include facial muscle movement, brain activity and skin temperature, and the technique has been applied to tension headaches, high blood pressure, asthma and phobias. 5. Reduced sympathetic arousal is the rationale for the relaxation response technique, and resistance built by exercise or immune benefit from social contact belong to other stress management routes. _Source: OpenStax Psychology (1st ed., CC BY 4.0), Ch 14 "Stress, Lifestyle, and Health", section 14.4 Regulation of Stress_