Published online by Cambridge University Press: 13 January 2022
So far I have tried to show how intelligence evolved at different levels according to the complexity of the environments faced. We have just seen how the breakthrough to cognitive intelligence emerged from the chatter between neurons in large networks. In this chapter, I show how human evolution involved another, even more stunning, breakthrough in a way not fully appreciated but fully consistent with biological principles. As with intelligent systems generally, it emerged from social interaction at a number of levels, not lucky genetic accidents.
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