A behaviour can be reinforced by simply rewarding it. However, this is called positive reinforcement. On the other hand, rewarding a behaviour by removing something negative such as home chores is called negative reinforcement. From the example, the kid is spared from doing the chores by increasing piano playing.
Negative Reinforcement is awarding a person by removing something.
The parent is decided to reward the child if she spends an hour practicing the piano that night. The reward will be to skip her chores the next morning.
The child will decide to play the piano for an hour because they don't want the negative consequence in the morning.
The child's response to be asked to play the piano is strengthened and they are more likely to be obedient because they do not want to have to do their chores the next morning, which is the negative effect of not playing the piano.
