REM sleep doesn’t require visualization. People born blind experience REM sleep just fine after all.
As for how we dream/visualize, well I can’t speak for others but for me, I simply remember the experience the same way I do a previous day. I can’t “picture” it like replaying a movie and watching it but I can remember details like some of what was said, what generally happened, where things were relative to each other.
For example I know a red car was red, just like I can remember seeing a red car yesterday. The information is there it’s just not stored as images.
What I can’t understand is how people who DONT have aphantasia differentiate reality from fantasy if they are seeing both when they “imagine” things.
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