The Origin of Consciousness in the Breakdown of the Bicameral Mind by Jaynes, Julian(January 1, 1976) Hardcover

This book is Julian Jaynes' theory of Bicameralism. This is the hypothesis in psychology that argues that the human mind once assumed a state in which cognitive functions were divided between one part of the brain which appears to be "speaking," and a second part which listens and obeys. This is the bicameral mind. Jaynes makes the case that a bicameral mentality came to be the normal and ubiquitous state of the human mind until as recently as 3000 years ago.