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neuroscientists know of people with “blindsight” who have no experience of vision because of damage to their brain, yet who can navigate a room without bumping into obstacles. they retain ability to process image, they miss ability to be conscious of it
https://www.quantamagazine.org/what-a-contest-of-consciousness-theories-really-proved-20230824/
@johnverdon During my younger years, I occasionally tried hallucinogens in high enough amounts that all I could see was lights, colors, and kaleidoscope images. I could not consciously see anything, but I made it around furniture, turned on light switches that I couldn't even see, for other people, and even survived staircases.
It seemed pretty clear to me that part of my brain could still see, just not the part I was trying to think with.