trapper/kcmo
the brain is very complex. i imagine all the nearly 7 billion of them out there are wired differently.
there are those who think in images and those who think in verbal constructs, and everything in between, of course.
i, too, am not much of a visualizer - very verbally oriented.
the brain can be trained. that kind of work can be hard and the child in us has nothing afterward to show our "parents" for external approval and reward. all that has to come from the inside.
i find that i can visualize to whatever extent i need to, but i dont go beyond that. others are said to have a photographic memory and can view a copy of a paper and read it as if it were in front of them without having actually memorized the words themselves.
i think a person can do whatever they put their mind to. the brain records everything, so the images are there. it is simply a matter of being able to retrieve that information. most retrieval is based upon word cues, but images can do it and smell is a very powerful memory cue.
there, you have just about exhausted what i know about the subject. there is a lot of info out there. i dont know which is more valid than others so you will just have to try things for yourself, hopefully without having to pay $295 for the book and CDs only to find it doesnt work for you.
one last thing. i experimented in my youth with a psychedelic or two. i had friends who swore they had charlie the tuna walk up to them and talk to them, big as life, and similar things. i never saw a thing. no images and only hints of color(and that could have been my imagination). physical blindness has been known to both come and go with blows to the head. i am not suggesting you do drugs or inflict a head injury, but there are clues as to the what and why of your question perhaps in studying some of those things.