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Visibility of flicker varies extremely strongly with absolute brightness, and varies somewhat from person to person. Some medicines can affect it. The last time I was in Europe, the TV in my room showed really visible flicker to me only on large bright areas - the average scene looked quite acceptable to me. One time (years ago) I had to use eyedrops for a few days to stop iritis (inflammation of the iris). This resulted in enhancing my flicker sensitivity to the point where I could see full modulation of the flicker from black to white on a 60 Hz NTSC display.
The colorwheel experiments done by Cliff Benham and shown at the early TV convention show that different people see different amounts of flicker at the CBS 24 frame/72 field rate, and everyone sees it on the NTSC wheel color converters.
These experiments also show clearly that it is the luminance flicker that is visible, not chrominance.
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