Student or Learner
Some people have some kind of disorder. (I'm not sure if I chose the correct word!) For example when they are speaking and they're a little nervous or stressed, they start blinking faster. Or maybe they, without any reason, bite their lips. Or another common one is they move one of their eyebrows up.
What do you call this, please?
A nervous tic.
A nervous twitch.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.