According to Jaynes, ancient people in the bicameral state would experience the world in a manner that has similarities to that of a modern-day schizophrenic. Rather than making conscious evaluations in novel or unexpected situations, the person would hallucinate a voice or "god" giving admonitory advice or commands, and obey these voices without question; one would not be at all conscious of one's own thought processes per se. Others have argued that this state of mind is recreated in members of cults.
http://en.wikipedia.org/wiki/Bicameralism_%28psychology%29
