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From Scientific American:
Experts have long suspected that complex social interaction drove the evolution of large brains in humans. Now a study in wasps supports and refines that theory: it seems that dominant individuals have larger brain regions responsible for higher-order cognitive processes.Biologists at the University of Washington observed the behavior of paper wasps (Mischocyttarus mastigorphorus) in the Costa Rican rain forest and then measured the size of their brains. The researchers found that the so-called mushroom bodies, the lobes that underlie learning and memory in insects, were larger in dominant wasps than in their subordinate peers.
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