Final answer:
Biofeedback is a widely used therapy that involves providing individuals with immediate information about the degree to which they can change anxiety-related responses, improving control over their physiological process of arousal.
Step-by-step explanation:
The widely used therapy that involves giving an individual immediate information about the degree to which he or she can change anxiety-related responses, thereby improving control over his or her physiological process of arousal is biofeedback.
Biofeedback is a technique that uses electronic equipment to measure a person's neuromuscular autonomic activity and provide feedback in the form of visual or auditory signals. By receiving this feedback, individuals can develop strategies to gain voluntary control over normally involuntary bodily processes. This therapy has been successfully applied to individuals experiencing tension headaches, high blood pressure, asthma, and phobias.