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Peekaboo is a game played over the world, crossing language and cultural
barriers. Why is it so universal? Perhaps because it’s such a powerful learning
tool.
One of us hides our eyes and then slowly reveals them. This causes peals of
laughter from a baby, which causes us to laugh in turn. Then we do it again. And
again.
Peekaboo never gets old. Not only does my own infant daughter seem happy to
do it for hours, but when I was young I played it with my mum ("you chuckled a
lot!" she confirms by text message) and so on back through the generations. We
are all born with unique personalities, in unique situations and with unique
genes. So why is it that babies across the world are constantly rediscovering
peekaboo for themselves?
Babies don't read books, and they don't know that many people, so
thesurprising durability and cultural universality of peekaboo is perhaps a clue
that it taps into something fundamental in their minds. No mere habit or
fashion, the game can help show us the foundations on which adult human thought
is built.
An early theory of why babies enjoy peekaboo is that they are surprised
when things come back after being out of sight. This may not sound like a good
basis for laughs to you or I, with our adult brains, but to appreciate the joke
you have to realise that for a baby, nothing is given. They are born into a
buzzing confusion, and gradually have to learn to make sense of what is
happening around them. You know that when you hear my voice, I'm usually not far
behind, or that when a ball rolls behind a sofa it still exists, but think for a
moment how you came by this certainty.
The Swiss developmental psychologist Jean Piaget called this
principle'object permanence' and suggested that babies spent the first two years
of their lives working it out. And of course those two years are prime peekaboo
time. Looked at this way, the game isn't just a joke, but helps babies test and
re-test a fundamental principle of existence: that things stick around even when
you can't see them.
Maybe evolution fixed it so that babies enjoy peekaboo for its own sake,
since it proved useful in cognitive development, but I doubt it. Something
deeper than mere education is going on.
Surprise element
Peekaboo uses the fundamental structure of all good jokes - surprise,
balanced with expectation. Researchers Gerrod Parrott and Henry Gleitman showed
this in tests involving a group of six-, seven- and eight-month-olds which sound
like more fun than a psychology experiment should be. Most of the time the
peekaboo game proceeded normally, however on occasion the adult hid and
reappeared as a different adult, or hid and reappeared in a different location.
Videos of the infants were rated by independent observers for how much the
babies smiled and laughed.
On these “trick trials” the babies smiled and laughed less, even though the
outcome was more surprising. What's more, the difference between their enjoyment
of normal peekaboo and trick-peekaboo increased with age (with the
eight-month-olds enjoying the trick trials least). The researchers'
interpretation for this is that the game relies on being able to predict the
outcome. As the babies get older their prediction gets stronger, so the
discrepancy with what actually happens gets larger - they find it less and less
funny.
The final secret to the enduring popularity of peekaboo is that it isn't
actually a single game. As the baby gets older their carer lets the game adapt
to the babies' new abilities, allowing both adult and infant to enjoy a similar
game but done in different ways. The earliest version of peekaboo is simple
looming, where the carer announces they are coming with their voice before
bringing their face into close focus for the baby. As the baby gets older they
can enjoy the adult hiding and reappearing, but after a year or so they can
graduate to take control by hiding and reappearing themselves.
In this way peekaboo can keep giving, allowing a perfect balance of what a
developing baby knows about the world, what they are able to control and what
they are still surprised by. Thankfully we adults enjoy their laughter so much
that the repetition does nothing to stop us enjoying endless rounds of the game
ourselves.
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