https://www.theverge.com/2016/4/25/11501230/blake-ross-cant-...
If there are people who can’t picture and people who don’t have an inner dialogue, I think it lends more credence to the idea that we don’t have free will and are just a bunch of chemicals controlling our behavior. It also makes you think about consciousness and whether it’s even real.
One of the more cliche, and not super useful tests, is “imagine a ball on a table, someone pushes the ball and it begins to roll. What color is the ball?” For me that was a revelatory statement because I’d never consider that others might give the ball a color, or size, or texture as the imagine it. I assume not everyone with the ability to visualize does but it seems like many do according to the literature. To me it’s just a statement, a ball is rolling pushed by a nondescript person.
Same thing happens if you ask “what surface is the table on” or “what country is this image in”. It’s layers I can add to the mental state, but if they’re not important they’re just not there.
I’d say the closest thing to what I was “seeing” before the color question is something like a wireframe, or maybe the gray color of a Blender model without colors/textures applied. Grey in the sense that you don’t really notice it’s grey, you just understand the grey color means color is absent.
What color was the ball? I didn't have to think; I knew it was red. However, I can't tell you much about the cabinets or the arm or body attached to the hand. Totally unrendered and void.