I can see the differance of a monitors refresh between 60-75-85 but not more than that. A friend and I tested it, he would set the refresh on my monitor randomly and I would guess the refresh, I was right most of the time.
I learned this as a pc repair guy in a previous life, I would look at someone else's screen (90% of people have their refresh at 60) and notice that it was 60. A quick test I use it to wave your hand in front of the monitor, see the strobing? The faster the refresh, the less strobing. I would postulate that when the refresh is high enough the strobing effect will go away, or at least match the normal strobing you percieve when looking at you waving hand.
Now here's the kicker, what is the refresh of your eyes/brain? It must have one, as you can see when an airplane propeller (or car wheel, or fan) speeds up, it looks like it slows, stops, then spins the other way. This can only be atributed to some sort of refresh in you optic center.
hmmmmm...