wigglyspider wrote:
Is it actually normal to be able to visualize someone's face after seeing them only once or twice?
Yeah, apparently it is. NTs have this special area of their brains that's dedicated just to recognizing and remembering faces; and how we found out about prosopagnosia was when NTs had that part of their brains injured, and couldn't recognize faces anymore, sometimes not even their own in the mirror.
Of course now we know that there are lot of people with what is called "developmental prosopagnosia", which is just being face-blind from birth, being able to recognize faces only about as well as you would recognize other objects that are similar to each other. For example, could you recognize your friend's tabby cat if you met the cat once, interacted with it for a half hour, and then saw it on the street the next day? Probably not. You might surmise that it is probably your friend's cat because it has the same pattern and is outside your friend's house; but you don't have a special area of your brain just for recognizing cats, so if you saw the cat somewhere across town, you wouldn't even make the connection. If you recognize a cat on first seeing it, it is probably your own cat, and you have known the cat for a long time.
Similarly, people with this non-injury-related face-blindness can generally learn to recognize people just like the average person can learn to recognize cats. It takes a while, and at first it's mostly by context and clothing and memorized distinctive features like jewelry, hair, or clothing. Depending on the degree of face-blindness, it may take years to learn to recognize somebody, or it could just require a few weeks of daily contact.