The secret weapon to sane parenting.
, but he immediately gets quiet once that song comes on. It's his baby kryptonite, rendering him incapable of continuing his fit.
While Addyman specialized in child developmental psychology and had done studies on babies' laughter , Stewart focused her work on how the mind and brain process music, and had previously done a co-study focusing on how parents can use their voice to help regulate their babies' arousal. She also studied "earworms,” or songs that get stuck in your head — “The Happy Song” soon to be one of them.
Additional insight included the knowledge that babies prefer their mother's voices over everything else, so the song should be something parents can sing along to. The song should be sung by a female vocalist in a higher pitch, having the qualities of "motherese" — the high-energy singsong tone we all naturally adopt when talking to babies.
"We were filming their reactions, seeing what they think of it. We also got the parents to rate what they thought about each piece of music. Then, in our lab, we had a motion-tracking system; we tried tying little things on the babies' hands and legs to see who would dance the most." That last method led to some complications. "You can imagine if you strap some things to babies' arms, they're going to try to get rid of it," Addyman explains.
The same babies came back for round two after Imogen had crafted two slightly different versions of a song with lyrics at varying speeds. The babies listened to both all the way through. "This time, we got even more ambitious with trying to capture their reaction. We dangled them in a baby bouncer to see if we could get them to dance to it," Addyman shares. "We had little heart rate monitors on them to see if they got more excited and when their heart rate goes up.
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