Julian Jaynes

Let us examine more closely what would have happened at the beginning of the breakdown of the bicameral mind. In I.4, we found that the physiological cuing of an hallucinated voice, whether in a bicameral man or in a contemporary schizophrenic, is the stress of some decision or conflict. Now, as the voices of gods become more inadequate and suppressed during this social chaos, we may suppose that the amount of that stress necessary to occasion an hallucinated voice would be raised. It is quite likely, then, that as the bicameral organization of mind began to diminish, the decision-stress in novel situations would be much greater than previously, and both the degree and duration of that stress would have to become progressively more intense before the hallucination of a god would occur. And such increased stress would be accompanied by a variety of physiological concomitants, vascular changes resulting in burning sensations, abrupt changes in breathing, a pounding or fluttering heart, etc., responses which in the Iliad are called thumos, phrenes and kradie respectively. And this is what these words mean, not mind or anything like it. As the gods are heard progressively less and less, these internal response-stimuli of progressively greater stress are associated more and more with men's subsequent actions, whatever they may be, even coming to take on the godlike function of seeming to initiate action themselves.