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human
At what age do babies usually begin to understand humour/jokes?

I have a 1yo, at about 7 months he began a behaviour which I think can be described as a very basic practical joke. First he thought it was funny seeing his soother in my mouth, I figure he understood it was his. He would take it from my mouth and put it in his own. This developed into him offering his soother to me, but pulling away at the last second, putting it in his own mouth and then laughing hysterically.

Obviously there is more going on cognitively than peek-a-boo or tickling. Has there been studies on how young children understand the concept of jokes, and what developmental impact this has if any?
gpt
At around 14 to 15 months, they’re able to understand that funny faces and illogical acts are meant to be laughed at. When you do something obviously silly, like pretend to eat off the plate as a dog would, it's particularly pleasing for your pipsqueak because he’s sure that’s not what’s supposed to happen, and being sure is a great feeling for a toddler who’s still unsure about so much of what he experiences.

And once their language skills have blossomed, they'll find rhymes and nonsense words funny too. Your toddler may also try making you laugh, perhaps by using your hairbrush as a cell phone, for instance. At around 24 months, he may point to his elbow when you say, "Show me your nose," or pick up a doll and call it a truck, simply to get a giggle out of you. And he’ll redo his stand-up routine again and again and again.