The visualization of recorded laughter is almost invariant among humans. That is to say – Everyone Laughs The Same. I’ve seen laughter recorded from I dunno how many people, dozens at least, maybe getting close to a hundred? And it always looks like this:
A series of choppy vertical lines, close together, with high spikes followed by deep dips. The “Ha-Ha-Ha” sound. It didn’t take me very long to learn this. It’s very easy to pick out laughter in tracks by sight, without any audio. And whenever I see these spikes coming down the line I smile, because I know what’s coming. I’ve come to associate this waveform with warm feelings. It makes me happy that all humans basically laugh the same.