Signal to noise

In 2011, renowned anesthesiologist Emery Brown began using EEG to track patients’ brain waves.EEG records the electrochemical activity between communicating neurons in the brain. 

During general anaesthesia, you can see, based on the patterns on the EEG monitor, how unconscious someone is, and you can dose your drugs accordingly. But testing whether EEG monitoring helps patients go under and recover better has produced mixed results.