Interesting, but not enough that I'll track down the paper.
https://www.cnn.com/2021/08/31/world/infant-great-ape-laughter-study-scn/index.html
Laughter transcends all languages -- and now scientists know this
spontaneous response
is universal across some primate species, too.
The laughing patterns of human infants match those of great apes,
according to a
study published Tuesday in Biology Letters.
Human adults primarily laugh while exhaling, whereas infants and great
apes laugh
during both inhalation and exhalation, said study author Mariska Kret, associate
professor of cognitive psychology at Leiden University in the Netherlands.
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