Introduction. 2. The Brain. 3. Working Memory. 4. Brain Evolution. 5. Primates. 6. Early Hominins. 7. Homo erectus. 8. The First Major Leap in Cognition: The Tree-to-Ground Sleep Transition. 9. Homo heidelbergensis and the Beginnings of Modern Thinking. 10. The Rise and Fall of Neandertal. 11. The Second Major Leap in Cognition: Enhanced Working Memory and the Evolution of Modern Thinking. Glossary. References
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A 2009 study studied this question.