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Smaller Testicles, Bigger Parenting Role, Study Suggests

Researchers explore why some dads are more nurturing

continued...

While the Emory researchers took a single blood test to measure testosterone levels in the men, Alukal suggested that it might have been more accurate to take multiple blood tests at the same time of day over a longer period of time and use an average.

He said the fMRI findings raise questions, too.

"What does the fMRI tell us in this regard? I don't know. fMRI has helped us with understanding brain activity, but there's a totally different interaction going on between a parent and a child compared to just being shown a picture of one's child. It's a poor stand-in," said Alukal.

He added: "The study scratches at the surface of the complexity of this subject."

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