DefinitionBiofeedback is a technique that measures bodily functions and gives you information about them in order to help train you to control them.InformationBiofeedback is most often based on measurements of:Blood pressureBrain waves (EEG)BreathingHeart rateMuscle tensionSkin conductivity of electricitySkin temperatureBy watching these measurements, you can learn how to alter these functions by relaxing or by holding pleasant images in your mind.Electrodes measure your heart rate, blood pressure, or other function. A monitor displays the results for both you and the trained practitioner to see. A tone or other sound may be used to let you know when you've reached a goal or certain state.While the practitioner describes stressful situations and guides you through relaxation techniques, yo