Understanding the human body is a team effort. That's where the Yachtel group comes in.

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This is Scientific American's 60-second science. I'm Christopher in Taguata. A baby's laugh is unmist's 60 Second Science. I'm Christopher in Taliatta.

A baby's laugh is unmistakable.

But aside from its squealing, high-pitched quality, there's another factor that sets a baby's laugh apart from ours.

Babies laugh on the exhale and the inhale, whereas adult humans tend to laugh predominantly on the exhale.

So the classic kind of ha, ha, ha, ha.

Disa Soder, a psychologist who studies emotions at the University of Amsterdam.

Sauter and her colleagues collected 44 samples of babies laughing, from the ages of three months to 10 months, all the way up to 18 months.

They played the samples for about 100 untrained volunteers and asked them to deconstruct the laughs,

where the babies laughing on the inhale,

the exhale, or both.

And there we find a nice relationship between the age of the baby and the amount of the

laughter that is happening on the inhale.

The younger the baby, the more laughs on the inhale.

Because remember, our laughs gravitate towards the exhale as we age,

and Sauter thinks one reason for that could be that we gain more vocal control as we learn to talk,

because speaking also happens primarily on the exhale. She presented the preliminary findings

at a meeting of the Acoustical Society of America in Victoria, Canada.

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