Machiavellian Intelligence Hypothesis
Elaborated originally in the study of primates, the “Machiavellian intelligence hypothesis” (Byrne and Whiten 1988, 1997) is that the large brains of humans grew over the millennia because of intense social competition for reproduction. Competitors evolved ever more complex strategies and tactics to achieve social dominance with consequent reproductive success. This hypothesis interprets even seemingly altruistic acts in primates as self-interested cunning.
The Hypothesis explains why primates have such large brains, far larger than that of other beasts of a similar size, far larger than necessary for most of their day-to-day lives. The brain size is puzzling because brains are expensive and fragile. They consume a great deal of energy; they are vulnerable to injury. What enlarged brain size brings is the capacity to interact socially and to remember previous social encounters (Humphrey 1976). Brains allow...
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