Twenty-seven years have passed since the last edition of this well known and widely respected book was published. In the intervening years, advances in structural and functional imaging have transformed the investigation of disorders of consciousness, and the “science of consciousness” has become a popular—even fashionable—pursuit. The new edition preserves the character and structure of its predecessors, but its creators, Jerome Posner and Fred Plum, have responded to the rapid advances in the subject in two …