When training your brain at Grey Matters, sensors are placed on your scalp and ear which read electrical signals or brainwaves coming from your brain. Nothing goes back to your brain through the sensors. You are given headphones to listen to music during the brain training session. The music is the platform for the feedback. The design of the brain is that we use auditory sense perception 24/7 to note changes in our environment. Neurofeedback was designed to use our brain’s natural way of noticing changes.