I just came across this old story (from 2009) about the importance of mom and dad in a child's life. The study looks at degu pups raised with and without dad. Those raised without dad showed more aggression and impulsive behaviors. Further, their brain cells didn't connect to one another as efficiently (technically, they had less dense dendritic spines) in the amygdala and orbitofrontal cortex.
Moms matter. Dads matter. It almost seems that's the way we were designed.
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