John F. Hoffecker explores the origin and growth of the mind, drawing on information from the human fossil record, archaeology, and history. Hoffecker argues that, as an indirect result of bipedal locomotion, early humans developed a feedback relationship among their hands, brains, and tools, evolving the capacity to externalize thoughts in the form of shaped stone objects. When anatomically modern humans evolved a parallel capacity to externalize thought as symbolic language, individual brains within social groups were integrated into a neocortical internet, or super-brain, thu.