Pacifier use retards emotional development in boys.

According to a UW-Madison study by psychprof Paula Niedenthal, who tested the boys and theorizes that the problem is that when you've got a pacifier in your mouth, you can't mimic the facial expressions you see, and it's this mimicry that causes the brain to become capable of feeling the emotion the other person is expressing.

That sounds plausible, but why is it a boy problem?

Niedenthal said studies on girls did not show the same phenomenon. She said that may be because of societal norms that prompt parents to work harder at encouraging the expression of emotion in girls.

Or maybe girls are innately more emotional. Maybe you want to plug in the pacifier so they don't get overemotional. If Niedenthal is right, and it's those parents trying so hard to get a smile out of their girls, why not use the pacifier on the boys but encourage them more? Eh. I don't know. I only had boys. We used pacifiers, and we were always trying to get them to laugh and smile. I seem to remember lots of smiling and laughing around the pacifier, which often fell out as a result.

Niedenthal... compared her work with babies and pacifiers to studies that have shown people who use Botox, which paralyzes facial muscles, have a more limited range of emotions and also have difficulty recognizing the emotions behind others' facial expressions.

Would that mean that if you're a woman who's all excitable and dependent on what other people think of you, you could go in for a good Botoxing so you could calm down and get things done in a more manly way?

[Niedenthal's] current research had a much less scientific origin. Her own three boys did not use pacifiers, Niedenthal said. She recalled a dinner at which her 3-year-old son was throwing a fit. She noticed that another child at the table, who was using a pacifier, did not respond to her son's flailing tantrum.

"The parents took the pacifier out, and the child still did not respond," Niedenthal said. "That's when I got the idea for this research."

Funny that the research showed that her boys were better off. Science! It has so many applications!

I don't know what emotional intelligence test Niedenthal used, but some of the tests were done on adult men who'd used pacifiers when they were babies. One test I noticed recently was the "mind in the eyes test." Try it.