Frequently Asked Questions > Science Questions > What is biofeedback?
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It's a way of using specialized devices to help people learn how to control body functions that are typically thought of as involuntary - for example heart rate or muscle tension. In the case of the StressEraser you are using your breathing to control changes in your heart rate and your stimulating and pacifying nerves. The StressEraser's visual and audio cues let you know how effectively you are doing that. Once you learn to use your breathing to control changes in your physiology, you can use that skill to achieve deep relaxation.