Here's the word and the image:
Sacks writes about language and the deaf, and how lacking and then receiving sign language changed their experience. I don't know if anything similar has been written about the blind. If someone had been blind since birth, they would not, could not, dream or think in visual images. How could they? For one thing, they wouldn't have any visual images, and much of the visual cortex would have been taken over for non-visual processing.
But, the blind would utilize other senses -- touch, taste, smell, and sound in their dreams. They might dream about a passage they read in braille and feel the braille words. It would be difficult for them to describe these dreams to a sighted - visual image dreamer, and visa versa. To each other, it would make sense quicker, better.
Because consciousness is our only access to reality. — Andrew4Handel
I wonder. I have lately been thinking that our consciousness, which we tend to think is like the pinnacle of the pyramid with the all seeing eye (image on the dollar bill reverse side). I've been thinking that maybe it is just one facility among numerous facilities that the brain operates. It seems like the pinnacle because what we hear and see, do, say, and think seems to be housed in the conscious mind. But maybe it isn't. (I'm not suggesting that mind transcends the brain; I don't think it does--at all.)
We know we have very Important, even critical, brain functions that we are not conscious of:
Memory; (we remember things, but we have no idea how memory is arranged; we have no way of auditing the contents of the memory.)
Movement; we have no conscious control--(except in a very difficult way, and then limited) over how to make our muscles move to produce coordinated and useful actions--like typing on a keyboard.
Vision; we have no knowledge and generally little control over how signals from the retina are interpreted and then integrated into a cohesive view.
Thinking; as I sit here writing this too you, the words are being fed to my fingers from a non-conscious source. I don't know how this happens.
Emotions; very important; we do not get to decide how we are going to feel about something a good share of the time. You meet somebody for the first time; you don't just like them, you fall for them head over heals. They turn you on every which way. You didn't intend this to happen, you didn't (perhaps) want this to happen, but it did. Or, try as you might, there are people that just strike you as disgusting.
and so on. I'm not saying our brains are not plastic; I'm not saying we are robots under the control of mysterious forces. I'm only saying that the Individual person has many systems between his ears not only keeping him alive but make him who he is, enable him to make his way forcefully in the world, and only SOME parts are accessible to, or part of, the conscious facility.
The motor cortex which moves us around, has to be aware of the world around it, has to know how the body is arranged in space from moment to moment, has to take directions from some other part of the brain (the way finding unit) and does this outside of our conscious mind. It receives information, makes decisions, and issues all sorts of instructions second by second--without telling us anything about it. We don't know and we don't need to know what is going on there.
A good share of our brain's always-on activity is not "un-conscious" -- it's just mostly not accessible to "THE consciousness where we live.
Take the "enteric brain" -- the nervous system that operates the gut. Do you really want to know, minute by minute, what it is dealing with? Probably not. Messages from the enteric brain to the cerebral brain are usually bad news: Alarm bell sounds, bright light blinks... Incoming message, red alert... "Contents of your gut are going to be expelled in 9 seconds, whether it is convenient or socially acceptable to you or not." and then it is expelled. Unless you were paying really close attention, you had no idea what was coming down the pipe, so to speak.