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army1987 comments on Irrationality Game II - Less Wrong Discussion
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A larger head makes death during childbirth easier, so I'd expect evolution to be optimizing processing power per unit volume even today.
Unfortunately, neurons are about as efficient in most species - they're already as optimized as you get. For that and other interesting facts, see http://www.pnas.org/content/early/2012/06/19/1201895109.abstract