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.
Jadi menurut ilmu neurobiologi, orang yang suka tertawa terbahak-bahak seperti orang tua saya yang tertawa berguling-guling di lantai karena sebuah lagu, mungkin memiliki dasar ilmiah berbeda dibanding tawa yang sopan pada interaksi sosial yang lain; ini tidaklah jelek, namun perilaku--bagian dari cara mereka berkomunikasi dengan Anda, bagian dari interaksi mereka; mereka melakukannya dengan tawa.