Two strikes against me on this one. I've got both Prosopagnosia (Face-blindnes) and Aphantasia (the inability to see a picture in my mind). Both self-diagnosed based on online tests, unlike my ASD, which is an official diagnosis.
Prosopagnosia (Face-blindnes)
The Cambridge Face Memory test is
linked here. The average score is 80%, and if you score under 60%, you might be face blind.
I've never met a person who is worse with names than me. I thought I was fine with faces for years, until finally I realised that a significant part of the problem is that, by the time I recognise someone's face, it's no longer appropriate to be asking their name.
I managed 38% on the Cambridge Face Memory test.
Aphantasia (Inability to see a picture in your mind)
There's a test
linked here.
I can recall in grade 2, the teacher doing quite a few exercises with us where we had to close our eyes and picture something, and being quite frustrated that I'd close my eyes, but couldn't see any picture in my mind.
Eventually, I decided that I wasn't supposed to be seeing any picture in my mind, that I was just supposed to think about whatever the teacher said, and then I wasn't quite so frustrated. I decided that nobody actually sees pictures in their mind, and that "picture a sunset" just means to think about a sunset.
The first time I did this test in the link above, I really didn't know how to answer the questions. How detailed is the picture I'm imagining? How can I answer that? The questions were basically meaningless to me, but I answered them anyway as best I could, and got a basically average score.
Then, after doing some further research, I found out that some people with Aphantasia can, in fact, sometimes see pictures in their mind; they just can't do it at will. And it's true - sometimes, I do involuntarily see pictures in my mind when I'm thinking about something, but as soon as I consciously try to do it, it goes away.
So I did the test again, this time trying to produce the same kind of image in my mind as I see invulunarily from time to time. And couldn't do it at all. My score on the test this time: 8/40, the lowest possible score, which indicates a high probability of Aphantasia.