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I'm not sure of the engish term but I think it's retinal persistence. the problem is that the eye has not the same refresh rate on all it's surface. I got sensitive eyes and that's why I'm very picky about refresh rates. i need 80Hz to feel comfortable when looking at the screen. any lower i can see it flash.
Simple auditory or simple tactile reaction time is about 40 ms faster than visual reaction time. When the visual stimulus is above the threshold for vision the simple reaction time increases to about 200 ms even for very small and brief light flashes.