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.
Il semble possible que la neurobiologie du rire involontaire, comme mes parents se roulant par terre à cause d'une chansonnette, puisse avoir une base différente d'un rire social plus poli, qui n'est pas un rire si terrible, mais qui est une attitude adoptée et faisant partie de la communication, partie de l'interaction avec vous, c'est un choix.