I was thinking about how dreams are just our brains processing visual data from our waking lives. But if someone has never had visual data to begin with, what does a dream actually look like to them? Is it just a radio play with physical sensations? Has there ever been a study on this?


As OP is asking about dreaming, I think “seeing” means pictures or brains produce during dreams that appear to the dreamer as if they were perceived through their eyes.
Yes
This is just another term that may be totally undefined to a person who is blind from birth.
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