by DarkAgesIt would be simple enough to check, since they only instructed the prisoner group (the psychopaths) to empathize with what they were being shown (the hands) it could be tried by anybody.
Just sit through an emotional video and try to empathize with the person in the video.
Do you feel a difference?
I tried with a beheading video and even though I thought that it must suck to die like this, I still didn't care about the victim and I wasn't feeling emotional at all and I was, as ever, fascinated by the brutality associated with decapitating someone.
Was the video of a drug lord, cutting of his girlfriends head with what looked like a pocket knife. For snitching ?
If so I had the same reaction you did.