The studies of violence in radio analyzes the degree of correlation between themes of violence in media sources (particularly violence in video games, television and films) with real-world aggression and violence over time. Many social scientists support the correlation. However, some scholars argue that media research has methodological problems and that findings are exaggerated. Other scholars have suggested that the correlation exists, but can be unconventional to what is mainly believed. Complaints about the possible deleterious effects of mass media appear throughout history; Plato was concerned about the effects of plays on youth. Various media/genres, including dime novels, comic books, jazz, rock and roll, role playing/computer games, television, films, internet (by computer or cell phone) and many others have attracted speculation that consumers of such media may become more aggressive, rebellious or immoral. This has led some scholars to conclude statements made by some researchers merely fit into a cycle of media-based moral panics. The advent of television prompted research into the effects of this new medium in the 1960s. Much of this research has been guided by social learning theory developed by Albert Bandura. Social learning theory suggests that one way in which human beings learn is by the process of modeling. Another popular theory is Cultivation Theory, which was founded by George Gerbner, which suggests that viewers cultivate a lot of violence seen on television and apply it to the real world. Other theories include Social Cognitive Theory, the Catalyst Model, and Moral Panic Theory, Social learning theory originated with Bandura's which suggests that children may learn aggression from viewing others. Modeling of behavior was observed in Bandura's Bobo Doll experiments. Bandura presented children with an Aggressive Model: The model played with 'harmless' tinker toys for a minute or so but then progressed onto the Bobo doll, the model lay the Bobo doll down and was violent towards it; punched its nose, hit it with a mallet, tossed it in the air, and kicked it.