The social learning perspective, supported by impressive empirical evidence, indicates that persons learn violent behavior through role modeling. Children of violent parents are more likely to attack their siblings, and lack of punishment teaches them that aggression is an effective response. Internal conditions also promote aggression. These include attitudes, cognition, and emotions such as anger. Empirical evidence indicates that people's conceptions of aggression affect their interpretations after viewing violence on television or reading about it in news accounts. Arousal also influences aggression. This may include frustration perceived as due to another's intentional efforts, vigorous exercise, stimulating drugs, loud noise, hot temperatures, or exposure to erotic materials. Regarding reduction in aggression, social learning analyses indicate that external control is effective. Also, rewards for alternative nonviolent responses can help reduce aggression, and if people are aroused by a variety of factors in their environment, it is possible for them to learn that alternative responses to this arousal can occur.