Over the last thirty years, physicians, psychologists, and "biofeedback technicians," in tandem with engineers, have developed sensors and procedures that have enabled hundreds of thousands of people to become aware of and to control even the most obscure aspects of their physiological functioning. For example, people can now use readouts of tension from their urethral and anal sphincters to control urinary and fecal incontinence, conditions that often resist all other medical and surgical interventions; and some epileptics can now use biofeedback from electroencephalograms to calm the irritable brain tissue that produces their seizures. Biofeedback not only produces replicable and powerful changes in many people's physiology and improvement in their symptoms, it also gives them a sense of connection to and control over their internal processes. This sense of mastery often generalizes to other aspects of their lives: people who have practiced biofeedback for a specific condition find it far easier to induce a relaxed state when confronted with any kind of stress. In time, many people who use biofeedback monitors learn to effect the same kinds of changes without them, using the power of their minds alone.
• Manifesto for a New Medicine : Your Guide to Healing Partnerships and the Wise Use of Alternative Therapies, Book by James S. Gordon; Perseus Books (Current Publisher: Perseus Publishing), 1998