Mxsmanic wrote in
:

writes:

There's a well-known phenomenon that can incapacitate pilots. A
propeller spinning so that it cuts through the sun's glare and causes
a stroboscopic effect on the pilot's eyes can result in confusion. A
frequency of less than between 25 and 55 Hz, depending on the
individual, can cause dizziness or nausea. It's called "flicker
vertigo" and the fact that it happens tells me that the human eyeball
(or at least the visual cortex) does have a frequency function of
some sort. 25 Hz on a two-blade prop would be 750 RPM and 55 would be
1650. Some tests have found that frequencies as low as four to 20 Hz
will induce it rapidly.

It is probably more a consequence of intermittent photic stimulation,


What, like the little sparks in your brain that make yu want to stay
indoors al da time?

Bertie