Dr. gauche likes to make fun of student comments in class. she finds that every time she does this, students make fewer comments the rest of the class period. apparently, dr. gauche's jokes are the students for talking in class.

I believe the answer is: punishing

Punishing refers to every action that being done in order to give negative reinforcement to the receiver. Punishing is often used as a method in behavioral modification by making the undesired behavior become associated with unpleasant feeling.