A Theory of Cognitive Dissonance

The central claim is that individuals possess a basic drive to maintain consistency among their cognitions, and that the existence of incompatible cognitions produces an aversive motivational state—dissonance—that the person is motivated to reduce . Festinger defines dissonance relationally: two elements are in a dissonant relation if the obverse of one follows from the other . Crucially, this definition does not require logical contradiction; it includes psychological incompatibility. The theory rejects the behaviorist premise that rewards have a direct, unmediated influence on behavior and the associated assumption that thoughts and feelings are not permissible psychological processes . It also rejects the idea that attitude change requires external justification; dissonance reduction can occur through internal cognitive restructuring alone.

The forced-compliance paradigm, reported in Festinger and Carlsmith (1959), remains the most famous test of the theory. Male students performed an extremely boring task—winding pegs on a board—and were then asked to tell the next participant that the task was interesting and enjoyable. Some were paid $1 for the favor, others $20. The $1 group subsequently rated the task as significantly more enjoyable than the $20 group . Festinger's explanation: the $20 payment provided sufficient justification for the counter-attitudinal statement, producing little dissonance. The $1 payment was insufficient justification, so the subjects reduced dissonance by changing their attitude toward the task itself. The design introduced a costly, irrevocable commitment as the condition for dissonance arousal .

The most sustained critique came from Chapanis and Chapanis (1964), who declared the theory 'not proven' and questioned the interpretation of key experiments, including the $1/$20 study . They argued that the $20 condition might have induced suspicion that froze attitudes at the neutral point rather than reflecting the absence of dissonance. Brehm (1965) countered that the $20 payment was framed as compensation for future participation, making the suspicion critique misdirected . A deeper formal criticism targets the vagueness of the phrase 'follows from' in the definition of dissonance: critics argue it permits experimenters to label nearly any inconsistent state as dissonance post hoc . Zajonc characterized the theory as 'not a theory in the strictly formal sense' but an heuristic device whose purpose is the stimulation of research . Festinger's own doctoral student Elliot Aronson later called the theory 'quite primitive' and lacking elegance, while acknowledging its extraordinary heuristic power .

The book synthesizes two strands in Festinger's prior research. His 1954 social comparison theory held that people evaluate their opinions by comparing them with others' opinions, establishing social reality . Dissonance theory extends this by specifying what happens when the cognitions thus validated clash with one's own behavior. The book also draws on When Prophecy Fails (1956), which documented how a group whose prophecy failed increased proselytizing—a dissonance-reduction strategy—rather than abandoning belief. Later, Festinger (1964) distinguished conflict from dissonance, clarifying that pre-decisional conflict lacks the systematic biasing of post-decisional dissonance . His final book, The Human Legacy, applied a related logic—unanticipated consequences of action—to technological evolution at the scale of the species, a striking departure from the individual-level cognitive mechanics of the 1957 monograph.

The book was published by Row, Peterson in 1957, with a subsequent edition by Stanford University Press . It made Festinger one of the most influential social psychologists of his era and was central to what is often called the cognitive revolution in social psychology, shifting the field's attention from observable behaviors to mental processes . The volume generated an unprecedented volume of experimental research in the decade following publication, with studies on decision-making, forced compliance, effort justification, and selective exposure . One assessment described the decade of activity as 'the most fruitful realization ever seen in social psychology' . The theory's influence was not confined to psychology: it has been applied in marketing, education, and political behavior, and continues to generate reformulations under new names .

The most persistent misreading treats dissonance as simple hypocrisy or as the conscious awareness of inconsistency. Festinger's dissonance is not a deliberate recognition of contradiction but an aversive drive state analogous to hunger or thirst . A second misreading assumes that people seek consistency as an end in itself. The theory holds only that dissonance is unpleasant and that its reduction is reinforcing; it does not claim that consistency is intrinsically desired or that people are rational in their pursuit of it. A third misreading collapses dissonance into logical inconsistency. The definition explicitly covers psychological incompatibility: a cognition may be dissonant with another not because it logically contradicts it but because it conflicts with what the person wants to believe or has committed to doing. Festinger himself later clarified that conflict precedes a decision, while dissonance follows it .