Decoding the void

Patrick Purdon, assistant professor of anaesthesia at Massachusetts General Hospital, examines what happens to the brain while under anesthesia. With the help of his colleague Emery Brown, the Warren M. Zapol Professor of Anaesthesia at Massachusetts General Hospital, Purdon explains the strange electrical signature they discovered, and why it just may be that sought-after indicator of when a brain is truly, totally, definitely unconscious.

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