So they had people play this game while they were being scanned in an fMRI, and two conditions: in some trials, they're told you're playing another person who's playing right now and we're going to match up your behavior at the end and pay you if you win.
Så de fik folk til at spille dette spil mens de blev scannet i en fMRI, og to betingelser: i nogle forsøg, blev de fortalt at de spillede mod en anden person der spiller lige nu og vi matcher ens adfærd til slut og betaler en hvis man vinder.