With faces, it's odd. When I go to visualize someone, I kind of get a fleeting glimpse, and then it fades and I can't make out anything except, somewhat blurre

With faces, it's odd. When I go to visualize someone, I kind of get a fleeting glimpse, and then it fades and I can't make out anything except, somewhat blurred, their hairline. No face at all. I'm pretty sure I know exactly what they look like - the recognizer is absolutely fine - but if I try to construct an image, it goes away. On the other hand, if I had to, I could probably draw a reasonable likeness from memory by a process of successive refinement, or I could sculpt a likeness from clay. But visualize internally - no, can't do it. I think it might be that when I'm fully awake, I can't maintain detailed visualizations very effectively. Faces are really important to us, but perhaps imperfect visualizations of faces fail to pattern match well enough against my recognizer, and so it blanks them. Like I say, I get the briefest glimpse in my visualization, but then it blanks. But maybe I'm over-rationalizing, and my brain is just weird.