Berkowitz (1989) revised the frustration-aggression hypothesis, proposing a theory of negative affect that suggested frustration is just one of many negative emotions, including loneliness, and jealousy that can trigger aggression. According to this view, aggression can result from a range of negative emotions, not just frustration. For example, getting a low grade on an essay might lead to feelings of despair, anxiety, and determination, highlighting that frustration is part of a broader spectrum of emotional reactions that can lead to aggression.