My guess at this point is that there are two ways to get the WWE in constant illumination:
One is if the viewer is subject to vibration of some sort (which might include, as well as electric toothbrushes, most cases of viewing from a moving car, the initial example my students raised). This would impose a stroboscopic effect on the visual system, of which we would be unaware as we are of saccadic inhibition.
The other way, whose existence is yet to be confirmed, would be if the viewer's eyes are, in fact, saccading rhythmically. My hunch is that this accounts for the "alloy-car-wheel" effect, which has been reported in this discussion. My guess is that for this one you need a fairly coarse pattern (alloy wheels r/t bicycle spokes; low-frequency fourier components), and probably a relatively slow rotation speed. If you can almost-but-not-quite follow the rotating pattern, you might track-jump, track-jump, fast enough to give the same strobe phenomenon.
That's my story, and I'm sticking to it until something
better comes along, which will probably be soon.
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