The document discusses three theories about how media affects audiences:
1. Temperament theory suggests people's reactions to media are based on their innate personality traits and will not be changed by what they watch.
2. Desensitization theory argues that repeated exposure to violent media can cause people to become accustomed to violence and less shocked by it.
3. Social learning theory maintains that people learn behaviors by imitating role models, so observing violence in media may encourage real-world aggression. However, the evidence for each theory is mixed.