Final answer:
The teacher is using the technique of negative punishment when belittling an individual's unsuccessful effort to perform a skill, and discontinuing this behavior when the individual successfully executes the skill.
Step-by-step explanation:
The teacher is using a technique called negative punishment when he belittles an individual's unsuccessful effort to perform a skill. Negative punishment involves removing a desirable stimulus or activity to decrease the undesired behavior. In this case, the teacher discontinues the belittling behavior when the individual successfully executes the skill.
This technique aims to discourage the undesired behavior by making the individual associate it with the removal of a desirable stimulus, which in turn reinforces the desired behavior. It is important for teachers to use positive reinforcement and encouragement to foster a positive learning environment.