The development of the modern brain

To better grasp the potent hold of the emotions on the thinking mind – and why feeling and reason are so readily at war – consider how the brain evolved. Human brains, with their three pounds or so of cells and neural juices, are about triple the size of those in our nearest cousins in evolution, the nonhuman primates. Over millions of years of evolution, the brain has grown from the bottom up, with its higher centres developing as elaborations of lower, more ancient parts. (The growth of the brain in the human embryo roughly retraces this evolutionary course.)

Goleman, D. (2004)

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