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Animal studies show that caregiving circuits can be reorganized in fathers.

Imaging studies show changes in fathers' brain structure after birth.

Testosterone tends to fall when men become partnered fathers; fathers who do more childcare have lower levels.

This post is Part 2 of a series.

My toddler son still comes to me when he is upset and says, “Tell me a story.” In Part 1, I wrote about how reward, touch, and a familiar sentence draw me into this ritual. Here I write about the staying, and about what fatherhood may be doing to a father’s brain over time.

Comforting my son also means managing my own response while trying to understand his. I feel mostly tenderness; I let that set the pace. My voice slows and stays low, even when the crying does not. Sometimes the story is not enough, and the approach is then simpler. I just keep holding him until he is ready.

Animal research shows how the brain supports parental care, and how it can be rebuilt for it. One key region is the medial preoptic area, found deep in the hypothalamus. In California mice, for example, damage to this area reduced pup licking and made it far less likely that mice would retrieve pups, in both males and females.[1] Mothers and fathers in this species share some of the neural machinery for tending to their young.

In a 2022 study of laboratory mice, Kengo Inada and colleagues[2] found stronger connections from the lateral hypothalamus onto oxytocin-producing neurons in fathers than in sexually inexperienced males. Activating that brain pathway in inexperienced males reduced their aggression toward pups, and activating the oxytocin neurons themselves promoted caregiving. This is a far more specific view of adaptation than a brain scan can offer. Alas, it does not show how my own connections have changed.........

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