For me, face blindness (prosopagnosia) is one of the most miserable of my social ineptitudes. Rarely can I remember a face, and even then it must be something highly unique or traumatic that makes it possible for me.
I had to explain to the students in the classes I taught, that they should not take it as an insult if I could not put a name with their face. I also pointed out that my ability to remember their face would be dependent on the venue in which I encountered them. So even after I got to where I knew them in class, if I met them at the local Wal-Mart, it might take me 15 minutes to figure out who they were.
I explained that I had to develop a background of information about them before I would be able to recognize them. And the more unique they were the sooner I would remember them. So for instance since the engineering classes had so few women I would probably learn their names faster. Also I would tend to remember the outstanding students sooner than the average ones, but that they should not let that go to their heads, because outstandingly bad worked just as well as outstandngly good.
For reasons that I do not clearly understand, there were always a few students who I developed an instant rapport with and I could usually count on remembering their names.
I became known for the fact that in each class each semester I would take a class photograph in the first few days and have the students write the name by which they wished to be addressed on it. I then put those names into the photograph and placed copies on the wall by my desk and also on outside of my office door. It was at least a little rewarding when I occasionally found other faculty consulting the pictures on my door, but they only needed to do so occasionally, I had to do it all semester. The only good side I could offer the students was that most of the time they could rest assured that I was grading the papers anonymously and not showing favoritism.
But the most I could hope for was maybe being able to recognize 20% of the class (size 7 to 35 students).by the end of the semester, and I would have the same students the next semester.
Alas, I have become the often embarrassed master of the art of "hey you". It causes me great grief.
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The thing that hath been, it is that which shall be; and that which is done is that which shall be done: and there is no new thing under the sun.
All the days of my appointed time will I wait, till my change come. Thou shalt call, and I will answer