Makes sense. I’d like to see an experiment done with reading comprehension as well as real memories. When I read something, I hear and see it. I’m reading it out loud in my mind and I either have instant visual associations with certain words (e.g. when I read the word aphantasia I think of the hippo from Fantasia, when I see the word tea I instantly ‘see’ a teacup) or I visualise the scene (like where they have the…
I have aphantasia. When reading I also don't "hear" the words (although I am capable, if I choose, of mentally simulating auditory input in a way for which I have no corresponding capability for visual input). I think I read much faster than average and have extremely high reading comprehension and recall for written material. Funny story: one benefit of not being able to visualize things is that I'm never disappoint…
When I think about it more, I think I almost feel the sounds on my tongue, which is to say, when I try to simulate the sounds, I do so by imagining how I would make the sounds with my mouth.
Also your point about casting choices for movie adaptations resonates. When a movie is made of a book I've been reading I'm almost always just so pleased by finally being able to see what the character looks like, and have never felt disappointment.
If anything while reading about characters, my mind cycles over possible physical attributes wondering which a character might have, but never really building anything resembling imagery.