I wish to be very clear that consciousness is chiefly a cultural introduction, learned on the basis of language and taught to others, rather than any biological necessity. But that it had and still has a survival value suggests that the change to consciousness may have been assisted by a certain amount of natural selection. It is impossible to calculate what percentage of the civilized world died in these terrible centuries toward the end of the second millennium B.C. I suspect it was enormous. And death would come soonest to those who impulsively lived by their unconscious habits or who could not resist the commandments of their gods to smite whatever strangers interfered with them. It is thus possible that individuals most obdurately bicameral, most obedient to their familiar divinities, would perish, leaving the genes of the less impetuous, the less bicameral, to endow the ensuing generations. And again we may appeal to the principle of Baldwinian evolution as we did in our discussion of language. Consciousness must be learned by each new generation, and those biologically most able to learn it would be those most likely to survive. There is even Biblical evidence, as we shall see in a future chapter, that children obdurately bicameral were simply killed.

• consciousness
• culture
• learned behavior
• language
• scripts
• evolution
• unconscious
• bicameral mind
• death
• change
• survival
• children
• future
• gods
• natural selection