I do not believe in my own case that I have things in my mind that correspond to visualisations either. Despite working for many years on visualisations in mathematics in which I can produce good external pictures on the computer screen to represent mathematical concepts, the pictures I conjure up in my mind are very different from the external representations. It is different with words. As I type this, I can hear the words in my mind and if I start saying them as I type, what I hear out loud is what I hear in my head. But homo sapiens has no “picture-projecting facility” for communication in the same way as it has a verbal “sound-making facility”.