According to research on the role of the brain and executive function in predicting aggressive tendencies, when very aggressive teenagers witnessed a situation in which someone intentionally inflicted pain on another person, they exhibited brain activity associated with

The individual is likely exhibiting brain activity associated with experiencing rewards because if a teenager is aggressive, then the individual is likely to feel pleasure when he or she sees aggressive behavior being performed in which when he or she pains being inflicted towards others, then it is likely to be a way of experiencing rewards.