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Welcome to the Association for Applied Psychophysiology and Biofeedback AAPB promotes the science underlying applied psychophysiology biofeedback and neurofeedback to improve health quality of life and performance through research education and practice. Join Now What is Biofeedback. Biofeedback is a process that enables an individual to learn how to change physiological activity for the purposes of improving health and performance. Precise instruments measure physiological activity such as brainwaves heart function breathing muscle activity and skin temperature.