1. Cognitive dissonance is an unpleasant psychological state that occurs when a person holds two or more inconsistent cognitions. 2. Leon Festinger's theory proposed that people seek to reduce dissonance by changing their cognitions to make them more consistent. 3. Festinger's 1959 experiment found that students who were paid $1 to lie about a boring task came to believe the task was interesting, while those paid $20 did not, in order to reduce dissonance between their actions and attitudes.