For a moment I thought this was going to go the route of Julian Jaynes' "On the Origin of Consciousness in the Breakdown of the Bicameral Mind" and claim that i

For a moment I thought this was going to go the route of Julian Jaynes' "On the Origin of Consciousness in the Breakdown of the Bicameral Mind" and claim that it actually came from something closer to deicide—the killing of a god—in that making a decision was disobeying the orders of the gods (voices) in your head. A pretty interesting, if controversial, book.