I think it's called exposition. It helps a lot in many situations because you became more confident. Someone says that stutter could born from an association between an event like a normal stuttering in childhood and a fear of stutter that makes the person afraid in that kind of situation. My big unresolved problem is my name. When I meet a new person and I did well, my self-efficacy increased and in the next presentation I'm sure that it will be good. But, when a don't meet anybody for a long period of time, the fear comes back...