Cognitive Dissonance Theory After 50 Years of Development

Research and theoretical developments on the theory of cognitive dissonance are reviewed. After considering the self-consis- tency, self-affirmation, and aversive consequences revisions, the authors review research that has challenged each of the revisions and that supports the original version of the theory. Then, the authors review the action-based model of dissonance, which accepts the original theory's proposal that a sufficient cognitive inconsistency causes dissonance and extends the original theory by proposing why cognitive inconsistency prompts dissonance. Finally, the authors present results from experiments examining predictions derived from the action- based model and neural processes involved in dissonance reduction.