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Brain Size. Brain size has increased threefold in the last 3 million years. Social Intelligence. OOne cause for greater brain size: sSocial intelligence: the ability to process information about the behavior of others and to react adaptively to their behavior.
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Brain Size • Brain size has increased threefold in the last 3 million years.
Social Intelligence • OOne cause for greater brain size: • sSocial intelligence: • the ability to process information about the behavior of others and to react adaptively to their behavior. • AAs group size grows, so do complexities • PPrimates live in social groups that are more complex than those of other animals
Social Intelligence • One ability that would have conferred a great advantage to survival and reproduction is the ability to predict other individuals’ behavior. • “The world of higher primates – of monkeys, apes, and humans – is quintessentially a game of social chess, a keen intellectual challenge. The challenge is keener yet than the ancient board game itself, because the pieces not only unpredictably change identity – knights becoming bishops, pawns becoming castles, and so on – they occasionally switch colors to become the enemy…” • (Leaky and Lewin 1992)
Theory of Mind: A chimpanzee is as likely to beg for food from a person who is unable to see the gesture as from one who is watching
