english: Chimpanzees laugh differently if they're being tickled than if they're playing with each other, and we might be seeing something like that here, involuntary laughter, tickling laughter, being different from social laughter.
non_english: Šimpanzy sa smejú inak pri šteklení a inak, keď sa spolu hrajú a niečo podobné vidíme aj tu, neúmyselný smiech, smiech pre šteklení, sa odlišujú od spoločenského smiechu.