Reinforcement therapy is the practice of creating a desired behavior by using rewards or punishments. In the context of the options provided:
1. Presenting a reward after a given behavior is an accurate description of reinforcement therapy. It involves providing a positive stimulus, such as praise, treats, or privileges, after the desired behavior occurs. This can increase the likelihood of that behavior being repeated in the future.
2. The introduction of a negative stimulus after a given behavior does not align with reinforcement therapy. This description more closely matches the concept of punishment, where an aversive stimulus is introduced to decrease the likelihood of the behavior happening again.
Therefore, in the context of reinforcement therapy, option 1 is the correct description. It focuses on using rewards to encourage and reinforce positive behaviors.