Hi Edward:
Recognition of performance is very important and there are many ways of conveying that. The most obvious is reviewing student's grades or status in the course. But the more frequent a teacher can make a personal connection with each student, even if that's just when they're sharing grades, I think that reinforces building a more positive relationship with the student. A personal connection creates a more comfortable learning environment, especially when the student feels they can ask their teacher questions and feel they're imposing or will be made to feel dumb.
Regards, Barry