Just a reminder. If you are doing these experiments on an external display, make sure you are doing so with your laptop lid closed (its screen off). Mac OS (and maybe other operating systems) do not properly operate its vsync synchronization from a laptop when using an external display while the laptop’s screen is also active. I have run into this problem multiple times.
Author should have tried CRTs. They can run at a plethora of refresh rates.
Some gaming monitors have adaptive framerates (g-sync / freesync).
This, I suppose, could be used to create very accurate timings.
Very interesting. I wonder if researchers take the time to make sure they have hardware that can handle such things