Final answer:
The example of a mother nagging her child to clean the room, which stops when the room is cleaned, is an example of negative reinforcement, as it involves removing an unpleasant stimulus to increase the likelihood of the behavior occurring again.
Step-by-step explanation:
The scenario where a mother nags her child to clean their room, and the child does it to make the nagging stop, demonstrates negative reinforcement. Negative reinforcement involves the removal of an adverse stimulus to increase the likelihood of a behavior's occurrence. In this case, the nagging is the negative stimulus that ceases once the child cleans their room, thus increasing the probability that the child will clean the room again in the future to avoid the nagging.
It is important to note the distinction between negative reinforcement and punishment. Reinforcement, whether positive or negative, aims to increase the likelihood of a behavior. In contrast, punishment, whether positive or negative, aims to decrease a behavior. An example of positive punishment could be adding extra chores when the room isn't cleaned, whereas negative punishment could involve taking away privileges, such as game time, for the same offense.