Calvin would continue their good behavior. Sometimes, they would subtract something unpleasurable to create a pleasurable feeling—like telling them they did not have to do chores or eat their vegetables; this [ Select ] ["positive reinforcement", "self-concept", "positive punishment", "negative reinforcement", "negative punishment"] also increases the likelihood of a behavior continuing or increasing. If the children misbehaved, they would take away something the children enjoyed—like television, playing outside, or visiting a friend--as a consequence in hopes that this [ Select ] ["negative reinforcement", "negative punishment", "positive punishment", "positive reinforcement"] would serve as a reminder that their behavior was not appreciated.