I can see Gabor filters under certain conditions, along with other visual transformations. I can't find anything about this in the literature.
Please email me if you can too - savantsight aaatttt tuta.io - I'd like to learn more about this phenomenon and how common it is.
I don't mean hallucinations, but rather something you can start and stop at will if you focus intensely.
I vaguely recall a paper about proving that the feline visual system uses Gabor filters, but I can't find it at this time. The conjecture was that it's thus going to be common to all mammals. But apparently no one has proven it for humans.
I plan to create a visual simulation of this phenomenon to better explain. I have a lot to learn about image processing first.