translation.en: So it seems possible that the neurobiology for helpless, involuntary laughter, like my parents lying on the floor screaming about a silly song, might have a different basis to it than some of that more polite social laughter that you encounter, which isn't horrible laughter, but it's behavior somebody is doing as part of their communicative act to you, part of their interaction with you; they are choosing to do this.
translation.zh: 所以看起来，很有可能， 那种难以抑制的、不由自主的笑， 就像我父母为一首愚蠢的歌 笑得躺在地上尖叫的那种笑， 可能与那种非常温和的， 你常遇到的那种社交性质的笑 有着神经神物学上的本质区别。 但它依然是人们进行交际时的一种行为表现， 是与人交互的一部分； 是他们选择的互动方式。