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Brains That Are Still Getting Wired In Babyhood

Melvin Konner

The Wall Street Journal

Dec 21, 2016

"Eventually, anthropology tells us, humans needed so much development that it could not all happen inside the womb. We came to need a “fourth trimester”—external gestation. Remarkably, the imaging studies done for the new paper suggest that the migration of brain cells over the frontal lobes goes on until 5 or 6 months of age."