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Human Brain Has Been Shrinking Since Stone Age

Yep. Don’t be surprised, though. This phenomenon began tens of thousands of years ago. And it isn’t a secret, at least on the circle of anthropologists. Based on skull measurements, the human (scientific name: Homo sapiens) brain in the last 40,000 years has decreased roughly around 10% in its average volume.

From Discover Magazine:

Based on measurements from 122 populations, modern adult brains range from 900 to 2,100 mL, with a global average of 1,349 mL, which is smaller than our Stone Age predecessors. However, we can’t reach meaningful conclusions from these species-wide global averages, in part because methods of skull measurement differ between datasets.

There are many theories that have been proposed for this phenomenon, like warmer climates being the reason for this event (this idea was countered, however), but the most convincing theory is that we humans underwent self-domestication.

Does a smaller brain mean that we are less intelligent? Find out more on the article at Discover Magazine!

(Image Credit: Wikimedia Commons)


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