When did John Dollard propose the frustration–aggression–displacement theory?
Frustration–aggression hypothesis
Frustration–aggression hypothesis, otherwise known as the frustration–aggression–displacement theory, is a theory of aggression proposed by John Dollard, Neal Miller, Leonard Doob, Orval Mowrer, and Robert Sears in 1939, and further developed by Neal Miller in 1941 and Leonard Berkowitz in 1969. The theory says that aggression is the result of blocking, or frustrating, a person's efforts to attain a goal.
Claude Steele
Self-affirmation theory was originally formulated as an alternative motivational explanation for cognitive dissonance theory that threats to the self led to a change in attitudes rather than psychologically inconsistent ideas, and self-affirmational strategies can reduce dissonance as effectively as attitude change.