all this human eye talk seems to say that no one knows why games run at 60fps.
I don't know either (really bad for somebody whody who is studying TV technology at uni, huh) but I would hazard a guess it would be down to TVs in most of the popular regions of games running at 60Hz...
I don't know I'll check it out to see if one of my textbooks has an answer
BTW I am definatley wrong with that theory as it refers to something completely different
*edit* p.s. the human eye can see well over 12fps. First off we percieve fluid motion at 18fps, but you would probably find it can see nearer 1000fps than 12fps