What Is Depth of Anaesthesia?

In 20 13, they published the results of a big experiment. Volunteers agreed to be put under anaesthesiain in an unusual way. They would very gradually give them more and or drug so that they would go deeper and deeper over the course of an hour. At the same time, their brain waves were being recorded at 64 different locations. By collecting all this data, emory and company were able to get incredibly precise brain signatures which showed exactly what it looks like when somebody loses consciousness.