That's an interesting story, especially since I too had migraines around that age. 'Never dropped on my head, AFAIK, but kicked in the tail a few times, and I suppose some might jump to their own conclusions about any connection therein.

I saw a TV program on brain hemispheres a number of years ago; 'may have been NOVA. At any rate, the experiments involved a number of patients - can't recall the exact malady, may have been Grand Mal seizures - who'd had their corpus callosums severed to cure or alleviate symptoms. Can't recall either the exact protocols of the tests these folks underwent, but the general idea was that, with one eye covered, they were unable to say/write(?) whatever it was they were seeing since the language center was in the opposite hemisphere. Something along those lines.

More persuasive however, are the work and theories of
Betty Edwards, author of Drawing on the Right Side of the Brain. As I recall, her main idea is that our educational system encourages the analytical, sequential left brain while neglecting the more intuitive right side. That is why, she says, that most people can't draw any better as adults than they did as children. Right-brain development has been stalled since their youth.

I've done a lot of drawing, accompanied with lots of effort and focus to let/make my left brain relax so my right brain can do its thing. But the left brain does not willingly relinquish control. There's nothing that disrupts a drawing class like people yakking, but music at such times is bliss. In the same vein, that's why even hands-free cell phones do not completely free a driver from a dangerous distraction.

Silence, as they say, is Golden, especially if one is involved in some critical task. As least for yours truly, I need all the brain power I can muster at such times. Multi-tasking is a crock. Focus is the key, no matter which side of my brain is in charge at that moment.

So, while I find all of this stuff enormously fascinating, I'm reserving judgment about the significance of the spinning model until I do a little more digging. Nevertheless, it is indisputable that everybody initially sees it turning one way or the other, or doing the twist, like Raoul. Some can learn to control perceived direction of rotation, others apparently cannot, and there are other variants, as well.

Cheers,
S