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I must add, back when I was using 3x 1920x1200 60Hz monitor for Eyefinity gaming, I did not see any visual defects either, hence I often scratch my head when peeps talk about such visual artifacts as I don't recall seeing any...even when I was using 60Hz monitors.
And I agree with those who've said they see no visual artifacts even at 60Hz. I mean, I played UT3 and Serious Sam TFE and TSE and netted well over 60fps on 60Hz monitors without issue. Even now, I can't perceive any gaming visual difference between my 144Hz and 75Hz monitor (other than res and size ofc)
But i agree on 75Hz
Our eyes do not work in frames. They work by continuously taking in light. While there is probably a lower floor as to what we won't perceive a difference below, this floor will vary depending on other criteria, and it is typically far smaller than 1/75th of a second.
Having 60 Hz on a given LED and not seeing a change at a more rapid refresh on that LED does not mean we can't see less than 1/60th of a second of change for a number of reasons. For one, if that LED is lit for 59/60th of a second, and not lit for 1/60th of a second, does it respond fast enough to actually have exactly 1/60th of a second be entirely absent of light (and the other 59th of a second entirely filled with the proper amount of light)? I'd guess probably not. Also, light overrides darkness anyway. Our eyes notice change differently depending on the change in light. So something that is nominally lit but then is briefly not lit might not be as noticed as something that is nominally not lit but then is suddenly briefly lit, even if we're talking the same time frame for both. These are both factors your example doesn't account for.
Put yourself in a bright room. Imagine looking at an entirely White display. Not imagine, for 1/100th of a second, that the display is changed to show a single frame with a value of 254, 254, 254 (very so subtly less White) instead of the 255, 255, 255 value it was showing for the other 99 frames that second. Do you notice it?
Now imagine that you're in an very dark room, and now the display shows a full White frame for 1/200th of a second. Even though the time is half as long, you probably would notice this, right? In fact, you may notice it depending on how long you've been in said dark room and having had your eyes adjust to it to begin with.
Then there's the fact that we have a higher concentration of rods to the sides, so we may notice changes more in peripheral vision rather than looking straight at it. You may have heard that some people may notice a flicker (such as from fluorescent lights or CRT displays as some examples) more prominently from their peripheral vision.
In other words, there are variables. It's not quite as simple as saying we have a strict frame rate limit. Our eyes just don't work in frames. The limit of what we notice as change also simply varies.
In any case, that doesn't really provide strong evidence that human sight has some strict limit that low to noticing change of something. Since I already addressed some faults with your prior example where you were suggesting it was higher, I'm surprised you'd try again with a weaker example of the same argument.
If you want anecdotal evidence though...
What about people who notice flickering on fluorescent lights? What about those who notice flicker on CRTs at 60 Hz?
What about the pilots who were shown a frame at 1/220th of a second and not only noticed it, but were able to correctly identify what was shown down to the exact plane?
Again, not that anecdotal evidence is entirely conclusive here, but at the very least, seeing at lower intervals does proves the limit of human sight isn't as low as has been claimed thus far.
It has nothing to do with tall claims by gamers. It has to do with understanding how both our eyes and the world around us work.
The limit of human eyes noticing change varies so there is no strict number, and the limit varies simply because our eyes work by taking in light, and not in frames to begin with. The less change and/or in a smaller interval, the less noticeable it becomes, until it can't be noticed. What the absolute threshold is isn't so clear, but making a convincing argument that it's so low (like 24 FPS, or even 60 FPS or 75 FPS) that it can be easily shown otherwise would be a challenging argument to prove for sure.