Some are smeared, and some are spots

[mmcirvin]

Classic hallucinations explained as normal modes of a differential equation describing propagating excitations in the visual cortex. A couple of papers on the subject are linked here.

Comments

[ex-askesis860.livejournal.com]

Given that my personal cosmology doesn't include any supernatural features, I always assumed that Deadheads, rave kids, and migraine sufferers were detecting features of their own consciousness. I never expected to see

da(x,φ,t)/dt = -a(x,φ,t) + I(x,φ,t) + ∫ dx' dφ' f(x-x',φ-φ')a(x',φ',t)

though. To me, that's cause for so much more wonder.

[urbeatle.livejournal.com]

you might want to look at this article about hallucinations associated with macular degeneration as a contrast.