I just finished reading the book. In it, he doesn't state that it happened at once everywhere. There was one passage that implied that the Aztecs were still m

I just finished reading the book. In it, he doesn't state that it happened at once everywhere. There was one passage that implied that the Aztecs were still mostly bicameral (or were in the immediate period after the bicameral breakdown) when the Spanish arrived in the 16th Century. Also, the breakdown is not instantaneous, but happens over time. Once it starts, you get religion and oracles (the Oracle at Delphi for example) as the populous attempts to hear the gods' voices for direction. Oracles lasted for about a millennium after the initial breakdown in Greece, and over time, the gods' voices were head less and less. He also states that modern remnants of the bicameral mind exist in hypnosis and schizophrenia (but in the case of hypnosis, how it works is very culturally dependent).