Although well beyond flicker fusion threshold, there is an indirect stroboscopic effect indirectly detectable by human eyes even at ~1000Hz. There are points of diminishing returns, but see my BlurBusters Blog Science & References
section -- relevant section copy and pasted below.
___________Now, on the other topic -- About CRT flicker versus PWM flicker:
...Most people have less eyestrain on LCD than CRT.
...Some people have always hated CRT and PWM LCD's.
...However, there's apparently a class of people who had no eyestrain with CRT >85Hz, but has eyestrain gaming with LCD (not always explained by excessive LCD brightness): Some CRT videogamers have no eyestrain on a CRT@120Hz, but the same videogamer have eyestrain on LCD even with 180Hz PWM.
This strange situation is explained (at least by some humans) by the fact that human eyes get tired focussing on blurry objects, and there is more motion blur on LCD's than on CRT's. (except when using LightBoost strobed backlight LCD monitors, which has zero motion blur, just like CRT
). So even though enabling LightBoost strobe mode essentially is a 120Hz PWM at 120fps@120Hz, it apparently has less eyestrain for certain fast-action video game players people than 180Hz or even 360Hz PWM, when playing certain games, due to the zero motion blur effect -- the zero motion blur effect may explain things for people who never complained about CRT's at >85Hz, but complains about 180Hz PWM (or even 360Hz or 420Hz)
. Obviously, not applicable to all humans, but apparently applicable to some.
BlurBusters.com Blog -- Eliminating Motion Blur On LCD'sEdited by mdrejhon - 1/5/13 at 5:10pm