Is there a science behind the ability to visualize peoples faces?
I've noticed that some people, after seeing their face for 10 seconds, I can clearly visualize it in my head for days and weeks afterwards. Other people, after spending a whole day or two with them, seeing their face for hours upon hours, I have real trouble clearly visualizing their face afterwards. I can see their general outline, and some specific features, but not most of the face or the expression. Are there any theories about what it means that I can't visualize a certain persons face even after spending a bunch of time with them? One friend told me that that happens when you care a lot about the person. Is that true?