"Thinking very hard about the same problem for several hours can produce a severe fatigue, close to a breakdown. I never really experienced a breakdown, but have felt "strange inside" two or three times during my life."

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This breakdown in the bicameral mind in what is called the Intermediate Period is reminiscent at least of those periodic breakdowns of Mayan civilizations when all authority suddenly collapsed, and the population melted back into tribal living in the jungles.

— Julian Jaynes