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See Inside July / August 2011

How Dads Develop

When men morph into fathers, they experience a neural revival that benefits their children



Photoillustration by Aaron Goodman

Last year I met my four-month-old nephew, Landon, for the first time. During the weekend I spent visiting him in San Diego, my inner science nerd often got the best of me. I would find myself probing my nephew’s foot reflexes and offering unsolicited explanations for why his toes curled this way or that, only to be met by my wife’s disapproving looks and the new parents’ blank stares. Soon enough I dropped the shoptalk in favor of baby talk.

Having spent my postdoctoral career in neuroscience, I have seen how important early experiences are for a baby animal’s health. In the first few days after birth, babies’ brains are like sponges soaking up their sensory environment. What to me seemed like inconsequential sights or smells had markedly different impacts on the impressionable newborns, shaping their brains as they tried to make sense of the unfamiliar world around them. But as astonishing as a baby’s brain is, on this family visit what struck me was the redevelopment of my 26-year-old brother-in-law.

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