"I don't agree with Steve Gould and everything, but I certainly agree with him on that," he says. "If we look at the human fossil record, it's remarkable that in our ancestry, over the space of about a million years, one human organ quadrupled in size." He adds: "To this day, we do not understand what the forces were that led the brain to undergo such incredible hypertrophy" In so doing, it produced a number of unique structures which are clearly modified versions of what were typical parts of a primate brain; organized in a somewhat different way in us.

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