EEG neurofeedback is widely regarded as a safe approach because it is completely non-invasive and does not deliver electricity into the brain or involve any drugs. Small sensors are simply placed on the scalp to record brainwave activity, and this information is then translated into visual and auditory signals, so the person can learn to gently self-regulate their brain activity. Most people tolerate sessions well and when side effects occur, they are usually mild and temporary, such as tiredness or mild headache. Side effects are rare and usually go away after a few sessions.