I recently found out that this condition I have now has a name "Aphantasia" - the inability to synthesise sense perception in ones mind. Things like mental images and inner voices don't mean anything to me, I do not have them.
Or well, I get an inner voice, kinda, but I do not hear it, it has not tone, no accent, no timbre, it is very hard to describe.

Here is a link to a site which deals with aphantasia and it has a set of questions which you can try and answer yourself, see how you fare.
http://aphant.asia/have-i-got-aphantasia

For me everything on there comes out absolutely zero, total aphantasia, regarding any senses.

It is impossible for me to imagine how it would be to not have this, to be able to actually visualise things I am not actually seeing with my eyes. I always knew that I could not do this, but being able to give it a name and talk to people who have it as well is comforting. It also seems to explain a lot, in terms of why I am the way I am.

When it comes to art it is also interesting. Basically I think on paper/in the program I am working in. I always liked to doodle, and to just combine things, try new things on paper. One of the reasons I enjoy doing those face sheets so much I reckon.

Would be interesting to hear from fellow artists who might have this as well, in varying degrees.