Think they're talking about shutter movies, not sure. But still, movies today with fast action sequences is quite hard to focus on surrounding objects. Have yet to see the Hobbit but have heard those blurred objects from motion blur will be extremely clear to the point it would feel uneasy at first. Just like going from a 60hz to 120hz monitor.Persistence of vision may also create an illusion of continuity, allowing a sequence of still images to give the impression of motion. Early silent films had a frame rate from 14 to 24 FPS which was enough for the sense of motion, but it was perceived as jerky motion. By using projectors with dual- and triple-blade shutters the rate was multiplied two or three times as seen by the audience. Thomas Edison said that 46 frames per second was the minimum: "anything less will strain the eye.
LOL so what he's saying is that with 48fps film makers/directors cant trick people with cheap directing lol. dunno how far some game developers would go with trying to hide mistakes in the rendering motion.And he has indeed accomplished that (48fps) — but in doing so, he’s killed a lot of the magic of what makes a film entrance an audience if you will, at least in my opinion