Decades of research suggest that our brains have shrunk over time, but not all scientists agree.
, suggests that our brains really haven’t shrunk at all in the last three millennia.
The researchers of that paper theorized that the advances human civilizations made around that time may have been responsible for the shrink in brain sizes. Around 1500 B.C., many humans began to live in larger cities, in more densely packed populations. “As groups make decisions rather than individuals, there would be less selection for intelligent individuals,” Villmoare says, summarizing the scientists' line of thinking.
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