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"Biofeedback is a type of complementary and alternative medicine called mind-body therapy. It's designed to enable you — in mind-over-matter fashion — to use your thoughts and will to control your body. Biofeedback is based on the idea, confirmed by scientific studies, that people have the innate potential to influence with their minds many of the automatic, involuntary functions of their bodies. "

"During a biofeedback session, a therapist will apply electrical sensors to different parts of your body. These sensors will monitor your body's physiological response to stress — for instance, your muscle contraction during a tension headache — then feed the information back to you via cues such as a beeping sound or a flashing light. The feedback will allow you to begin to associate your body's response — in this case, headache pain — with certain physical functions, such as your muscles tensing.
Once you begin to recognize that your headache is a result of tense muscles, the next step is to learn how to invoke positive physical changes in your body, such as relaxing those specific muscles, when your body is physically or mentally stressed. Your eventual goal will be to produce these responses on your own, outside the therapist's office and without the help of technology. "

more here--- Biofeedback: Using your mind to improve your health - MayoClinic.com