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A SINGLE mutation may have cleared the way for rapid brain evolution. Other primates have strong jaw muscles that exert a force across the whole skull, constraining its growth. But around 2 million years ago a mutation weakened this grip in the human line. A brain growth spurt began soon after (Nature, vol 428, p 415).
What drove this spurt is another matter. The environment probably presented mental challenges. Social developments would have played a part, too. To test the relative importance of these pressures, David Geary at the University of Missouri in Columbia compared the skull size of various hominins against environmental conditions each lived in, such as the estimated variation in annual temperatures, and against proxies for social pressure, such as group size. Both were associated with bigger brains, but the difficulties of navigating a larger social network had the greatest impact (Human Nature, vol 20, p 67).
A big brain is incredibly hungry, so early humans needed to change their diet to support it. The transition to eating meat would have helped. So would the addition of seafood about 2 million years ago, providing omega-3 fatty acids for brain building (Proceedings of the National Academy of Sciences, vol 107, p 10002). Cooking might have helped too, by easing digestion. This would have allowed ancestral humans to evolve smaller guts and devote the spare resources to brain building.
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