When did John Dollard propose the frustration–aggression–displacement theory?
Frustration–aggression hypothesis
The Yale group’s hypothesis does not explain why aggressive behavior could be manifested in different social environments without previous provocation or feeling of frustration. However, according to Gross and Osterman, people may lose their sense of uniqueness in mass societal contexts because it tends to deindividuate them.[36] For instance, individuals may behave aggressively when they are with their friends or in a big crowd (e.g. while watching a hockey game), but might not behave aggressively when they are by themselves (e.g. watching the game alone at home). When individuals are in a crowd, they are more likely to become desensitised of their own actions and less likely to take responsibility. This phenomenon is known as deindividuation.[36]