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Studies since that time have shown it to be effective in some cases, and that even involuntary functions could be controlled by the mind. The fact is, some people seem to be able to will themselves into a healthier state. The purpose for most biofeedback is to teach people how to relax. Stress can cause or worsen a lot of physical problems—getting rid of the stress can be a cure. Biofeedback devices vary, but most systems include sensors or electrodes that are placed on the skin or fingers.These sensors can detect changes in heart rate, skin temperature, or muscle tension. For example, in treating high blood pressure, a person may be instructed to relax and take deep, regular breaths until a light on the device comes on, indicating that their blood pres- sure has gone down. With some biofeedback systems the user wears a headset or small metal discs are attached to the scalp, and brain waves are measured through an electroencephalogram (EEG), a test that shows electrical activity of the brain.The devices are frequently used to diagnose and monitor epilepsy, seizures, brain diseases, hyperactivity, post-traumatic stress, and other ailments involving the mind. When meditating (or practicing mindfulness ), a person using a biofeedback machine can see if he or she is producing brain waves that indicate a relaxed state. Some current devices may present an image that represents calm when this peaceful state is reached. One such device presents an image of an increasingly bright sunrise as the person strives for maximum relaxation. Sometimes therapists run biofeedback sessions, but systems are

available for home self-use as well. Afford- able systems can plug into laptops, tablets, and smartphones. To achieve a condition of relaxation, individuals might concentrate on specific images or tighten and release cer- tain muscles.

Find out more about biofeedback and the science behind it.

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Healing