The human brain, more than any other attribute, sets our species apart, growing in size and complexity to enable language and coordination unprecedented in life history.
According to neuroscientist Sam Vickery, while brain expansion improved capabilities, it also made the human brain more vulnerable to the effects of aging.
Evolutionary biologists have studied how human brain regions evolved from primate ancestors, realizing that not all areas expanded equally throughout evolution.
Despite its size, the human brain's distinct regions varied in growth rates; some areas expanded significantly while others did not keep pace, challenging previous assumptions.
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