When Richard Hammond lost control of a £2 million supercar, he ended up in a coma. In a recent video Richard talked about this experience and how his wife screaming at him ultimately brought him out of his coma. It got us wondering what is the brain doing when in this state of unconsciousness and how aware is it of what is going on.

Sean was joined by Professor Shane O’Mara, Professor of Experimental Brain Research in Trinity College Dublin...