From what I’ve learned being an internet person, humor is a very complex social and intellectual trait that few animals have evolved the capability for. Doesn’t answer your question but I’m just guessing it’s a byproduct of the ability to be empathetic and recognize social queues and is beneficial to the group as a whole. It might be a learned behavior to give feedback. You might make up a bad joke, but you always will tell it to that friend that laughs at everything.
It’s a physical response to resolving tension in a positive way.
The setup to a joke or the normalcy of a situation is the base line. The turn in the joke or an abnormal thing happening, especially suddenly, sets up the tension. The punchline of the joke or the abnormal thing turning out not to be dangerous or having resulted in some bad outcome introduces a surprising resolution to that tension.
Then we laugh, we have a physical reaction to that tension being resolved. We show others that we are relived and relaxed and safe that they should not be tense.
That’s the baseline. Obviously there are a lot of different laughs for lots of different reasons, that’s because we are social creatures in a complex world and can be conditioned to respond to a lot of things in a lot of ways.
My understanding is that the best hypothesis among neuroscientists right now is that laughter is an extension of an early primate’s “all clear” signal. The idea is that you see or hear something that seems like it might indicate danger, but then you identify the source as something that is actually silly and innocuous. You make a noise, both to release the tension of the situation and to indicate to your fellow primates that there is no actual danger here. In other words, “Ha ha! For a second I thought that vine was a snake.”
Most jokes in some way hinge upon this mechanic. The setup builds up some kind of tension, and then the punchline reveals the source of the tension to actually be something silly rather than serious.
It’s also theorized that this may have something to do with the reason why we laugh when we’re tickled. Tickling is the rough equivalent of the “play-fighting” instinct in cats and dogs–someone reaches out and grabs you in a manner that seems threatening, and weak spots (like your armpits, neck, and belly) are the ones that elicit the strongest response. The person being tickled laughs, as a way of indicating to onlookers “Don’t worry, this is not actually a threatening situation! We’re just playing!”
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