Some people can't see mental images

> He knew, of course, that people talked about “picturing” or “visualizing,” but he had always taken this to be just a metaphorical way of saying “thinking.” Now it appeared that, in some incomprehensible sense, people meant these words literally.

This is the quintessential aphantasic experience. I still struggle to believe that other people "see" things in their heads.

I still struggle to believe that some can't. There's just always been an abstract 'canvas' separate from the one signals from my eyes end up on and I can 'draw' on it by thinking about visual stimulus, and it's hazy but perceptibly there, the same way I 'hear' a song when I think about it. When this subject comes up I also always want to ask if people with aphantasia can hear sounds or music in their head. Or a taste or smell, etc..