What example illustrates positive reinforcement?

The example of the dog receiving a treat after performing a trick correctly illustrates positive reinforcement because it involves adding a pleasurable stimulus (the treat) following a desired behavior (performing the trick correctly). This process increases the likelihood that the dog will repeat the behavior in the future, as the dog learns to associate the action with the reward. Positive reinforcement is a fundamental principle in operant conditioning, where behaviors are strengthened through the introduction of rewarding stimuli.

In contrast, scolding the dog for peeing in the wrong area, yanking the leash when the dog pulls, or ignoring unwanted behaviors do not fit the definition of positive reinforcement. Scolding and yanking are forms of punishment aimed at discouraging undesirable behaviors, while ignoring unwanted behaviors does not provide any additional positive stimulus to reinforce the desired ones.