I can visualize just fine, but literally cannot imagine smells. It makes adding full sensory fluff to tabletop games frustrating, and makes me get confused when authors do it to any great extent.

Trying to learn how to draw informed me how much caricature I keep in my mind. I'm more 2 because I lack the training in perspective and form to internalize the world in a way that actually lets me recall an apple.

I'm like a 2 but I can't hold the image for more than a second or so.

I can hold one image like that in my mind and focus on it for a full 3.5 minutes without interruption. By harnessing this level of concentration I have learned to see without my eyes and can read the front of the playing card while looking at the back.