The video doesn't portray the left-vs-right correctly. As the person and screens are set up in the video, the left and right eye both experience the left and right images presented on either side of the point-of-fixation. However, the video portrays all information from left eye going to right brain, and all information from right eye going to the left brain ... that's not how it happens ...
... rather, the left-hemi-visual-field from both left- and right-eyes goes to the right brain, and the right-hemi-visual-field from both eyes goes to the left brain, as depicted in [1].
> Yes, and you lose a hemi-field in both eyes if you have a stroke in the visual cortex on one side of the brain.
In my case the aura of my migraines (that I thankfully only had during puberty) were limited to the left hemi-field. Which I guess suggests that the migraine was "centered" in the right brain hemisphere.
Do we know anything about migraines based on their symptoms? As in, has there been any research where people with different migraine symptoms have been put in a scanner during the migraine to locate which parts of the brain display weird activity?
The migraine aura is rather well understood, it is the result of cortical spreading depression, a phenomenon where a "wave" of brain hyperactivity spreads in as a ring on the surface of the cortex, leaving a hypo-active zone in the middle.
It is possible to trigger the phenomenon by hurting the brain (e.g. sprinkle acid on a rat's brain, WP has a neat video: https://en.wikipedia.org/wiki/Cortical_spreading_depression) so we suppose that it is a defense mechanism in humans too, but we're not sure what causes them.
I've done research on migraine, 10 years ago, but I haven't kept up with the field. There are hypotheses, but no known cause for the headaches and associated symptoms.
the graphics indeed failed to reflect the fact that each eye is split vertically into two fields of vision that go to separate brain hemispheres (the inner field going to the same-side hemisphere and the outer half going to the opposite), but the narration was accurate: focused on a point between two screens, the left hemisphere sees only the right screen, and visa versa.
... rather, the left-hemi-visual-field from both left- and right-eyes goes to the right brain, and the right-hemi-visual-field from both eyes goes to the left brain, as depicted in [1].
[1] http://fourier.eng.hmc.edu/e180/lectures/eye/node4.html
EDIT: grammar