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Cognitive dissonance was defined in 1957 by:

APhilip Zimbardo
BLeon Festinger
CSolomon Asch
DStanley Milgram
Answer & Solution
Correct answer: B. Leon Festinger
1. Several classic social psychology ideas are tied to particular researchers. 2. Psychologist Leon Festinger defined cognitive dissonance in 1957. 3. He described it as psychological discomfort arising from inconsistent attitudes, behaviors, or cognitions. 4. Asch studied conformity, Milgram obedience and Zimbardo social roles. _Source: OpenStax Psychology 2e (CC BY 4.0), Ch 12 'Social Psychology', sections 12.1-12.5_
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