english: 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.
non_english: Čini se da neurobiologija bespomoćnog,  nevoljnog smeha, kao smeh mojih roditelja koji leže na podu vrišteći zbog blesave pesme, može imati drugačiju osnovu  od učtivijeg društvenog smeha sa kojim se susrećete,  koji nije grozan smeh, već ponašanje nekoga koji ovo radi kao deo komunikacionog čina prema vama, deo njihove interakcije sa vama; oni biraju da ovo urade.