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therapy is a treatment technique that enables people to use signals emitted from their own body to monitor and improve their health. It is the "use of instrumentation to mirror psychophysiological processes of which the individual is not normally aware and which ....

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.... of homeostasis. In order to control or altar behavior, a person must have information that is available through the senses. In biofeedback, the client obtains information about his biological state from feedback from the sensors. Margolin and Kubic (1944) conducted an early example of this kind of feedback. They used a subject's amplified respiration and heart beat to induce a hypnotic induction. Even though the subjects were not told to adjust these physiological functions, the feedback of their biological system was used to alter their conscious and emotional state (O'Hair). The principles of operant conditioning have often been used by people to ....