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The Dutch version of this is to wave at the cheek.
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I am Dutch and moved to Canada about 20 years ago (my wife is Canadian). Imagine our first meal at my new in-laws, and me not speaking much French yet (we're in Quebec), and still wanting to show my appreciation for the meal...
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jazz hand(s) !
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> that some behaviors transcend culture and go back to instinct

My first thought was "is it only Italians and Dutch, or are the two the only groups they could cover with their given funding?".

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> Here we ask whether, in a task where gestures are particularly useful—namely, spontaneous demonstration in which no real object is present—speakers of a high-gesture (Italian) and a low-gesture (Dutch) culture show similarities or differences in how they teach to adults versus children.
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Correct but it doesn’t invalidate my question :)
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The trick to training rocks is telling them to perform behaviors they're going to do anyway.

https://www.youtube.com/watch?v=SG0FAKkaisg

Oh, rooks! I though you said rocks. Never mind!

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I don't think these are special as in rare, but they are cool. Many countries have gestures for the same thing. In portugal you pick up the ear lobe with your index finger and thumb, stretch the other fingers and pull it a few times. It means tasty also. You may accompany it with saying "it's from here", as in the food "is from the earlobe" which means its good, but mostly its done silently.
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