Thie above priniple - brain miniaturization driven by software innovation - would be another example of the Baldwin effect: Ideas change gene frequencies, biology, and the course of evolution: https://plus.google.com/101046916407340625977/posts/BsHfE9rP7xd …
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Another story is that farming life was less cognitively demanding. Self-domestication resulted in the same sort of brain size reductions as happen when we domesticate other animals.
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Only DemocratSlaveryParty POLs. Their brains are in their nether regions and have been diminished by the stench.
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I think it may have been you who posted another recent study that showed that more intelligent people have fewer neural connections, not more as previously presumed. Intelligence can result from streamlining of efficient circuits in the brain. This may explain smaller brains.
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