A similar phenomenon occurs during video gaming in these situations, e.g. display-based motion blur masking lowness of framerate:
-- Console gaming on plasma 30fps versus LCD 30fps.
Some people say they prefer console gaming on LCD 30fps because it looks smoother (because motion blur is masking the lowness of the 30fps). Though it is a personal preference if you prefer LCD motion blur versus the plasma double-image effect (flickering/strobing edges during motion).
-- LightBoost (LCD motion blur elimination) on 120Hz computer monitors, when playing at low framerates.
LightBoost eliminates motion blur so dramatically that low framerates are much easier to distinguish from higher framerates, since there's no motion blur to mask the lowness of the framerate.
So as a result, for LightBoost to really be worth it, you need triple-digit framerates (since LightBoost behaves like a 120Hz CRT).
-- CRT 30fps-vs-60fps is easier to see versus LCD 30fps-vs-60fps. (e.g. TestUFO: Framerate 30fps vs 60fps Animation -- play this on a CRT, then play this again on LCD). This is because motion blur on most LCD's is masking the lowness of the framerates, making them less distinct than on a CRT.
Intentional source-based blur (film) is just another technique to mask the lowness of the 24fps film framerate.
Edited by Mark Rejhon - 7/27/13 at 11:55pm