Cognitive dissonance is the discomfort produced by holding two cognitions that do not fit together — and the pressure that discomfort creates to make them fit. Leon Festinger proposed it in 1957. The reason the term survived is that it makes an unusual prediction: the less you are paid to say something you do not believe, the more likely you are to end up believing it.
- Cognitive dissonance is a state, not a behaviour. It is the tension between clashing cognitions, and it motivates whatever comes next.
- Festinger and Carlsmith tested it in 1959 by paying students one dollar or twenty dollars to tell a stranger that a boring task was fun.
- The one-dollar group later rated the task as genuinely more enjoyable. The twenty-dollar group did not.
- Small rewards produce more attitude change than large ones, because a large reward is reason enough on its own and a small one is not.
- There are four ways out: change the action, change the belief, add a belief that reconciles them, or decide it does not matter.
- Cognitive dissonance is not hypocrisy, not denial and not confirmation bias, and the three are mixed up with it constantly.
What is cognitive dissonance?
Cognitive dissonance is the psychological discomfort a person feels when two of their cognitions — beliefs, attitudes, or knowledge of their own behaviour — are inconsistent with each other. Festinger’s claim in “A Theory of Cognitive Dissonance” was that this discomfort works like hunger: it is unpleasant, it motivates, and it keeps motivating until something reduces it.
The prediction that follows is what made the theory testable. If dissonance is a drive, then people should be observed changing whichever of the two cognitions is easier to change. Usually that is the belief, because the behaviour has already happened.
Note what dissonance is not, in the theory’s own terms. It is not the clash itself. It is the felt discomfort produced by the clash, and everything interesting the theory predicts is about how people get rid of it.
The one-dollar experiment, 1959
The study everyone cites is Festinger and Carlsmith’s “Cognitive consequences of forced compliance”, published in the Journal of Abnormal and Social Psychology in 1959. It is short, it is elegant, and its result runs against ordinary intuition about incentives.
What they did
Seventy-one male students at Stanford spent an hour on two deliberately tedious tasks: loading twelve spools onto a tray and emptying it again, over and over with one hand, then turning each of forty-eight square pegs a quarter turn clockwise, then a further quarter turn, for another half hour.
Afterwards the experimenter explained that an assistant had not turned up, and asked the participant to tell the next person waiting — in fact a confederate — that the tasks had been enjoyable and interesting. One group was offered one dollar to do this. Another was offered twenty. A control group was asked to say nothing at all.
Every participant was then interviewed, ostensibly by the psychology department rather than by the experimenter, and asked how enjoyable the tasks had actually been on a scale from minus five to plus five.
What happened
| Condition | What they were asked to do | Mean enjoyment rating |
|---|---|---|
| Control | Nothing — no request to misrepresent the task | −0.45 |
| One dollar | Tell the next participant it was enjoyable, for $1 | +1.35 |
| Twenty dollars | Tell the next participant it was enjoyable, for $20 | −0.05 |
The people paid one dollar reported liking the boring task more than either other group. The people paid twenty dollars rated it about where the control group did — that is, boring.
Why the small payment mattered
Because twenty dollars is a reason. A participant paid well can hold both cognitions comfortably — the task was dull, and I said it was fun, reconciled by the fact that I was paid twenty dollars to say so. The dissonance is resolved before it starts.
A participant paid one dollar has no such reason available. The behaviour cannot be undone, and the payment is too small to justify it, so the cheapest cognition to adjust is the opinion of the task. Insufficient justification, in the theory’s vocabulary, is the engine of the whole effect.
The same logic explains the finding Aronson and Mills published in the same year: students who went through an embarrassing initiation to join a discussion group rated the group as more worthwhile than students admitted easily. If the group is dull and you suffered to enter it, one of those had better change, and it will not be the suffering.
Four ways people resolve dissonance
Festinger’s theory does not predict which route a person takes, only that the pressure exists and that the easiest change wins. There are four routes, and knowing them is what turns the term from a label into something you can use.
| Route | What changes | The smoker’s version |
|---|---|---|
| Change the behaviour | The action is brought into line with the belief. | Stop smoking. |
| Change the belief | The cognition about the world is revised. | Decide the evidence is weaker than claimed. |
| Add a consonant cognition | A third belief is recruited to reconcile the first two. | “My grandfather smoked until he was ninety.” |
| Reduce the importance | The whole conflict is demoted. | “Something has to get you in the end.” |
The first route is the rarest, and that is the theory’s most useful implication. Behaviour has already happened and is expensive to reverse; beliefs are free. So when an action and a belief collide, the belief tends to be the one that moves.
Four everyday examples
The expensive purchase
People rate a car, a phone or a course more highly after buying it than before. The decision has been made, the money is gone, and the rating adjusts to match.
The unpaid effort
Volunteers, unpaid interns and members of demanding organisations often report more commitment than better-compensated participants, which is exactly the Aronson and Mills pattern.
The meat paradox
Most people say they care about animals and eat them anyway. Loughnan, Haslam and Bastian showed in 2010 that participants who had just eaten beef jerky attributed fewer mental capacities to cows and gave food animals a narrower moral status than participants who had eaten nuts.
The small lie at work
Saying something you do not believe, for reasons too weak to justify it, is the laboratory setup transplanted into an office. Being paid well for it, oddly, protects the belief.
What cognitive dissonance is not
The term has escaped into ordinary speech, where it usually means “you are being a hypocrite”. That is not what it names, and four distinctions are worth keeping.
- Not hypocrisy. Hypocrisy is a judgement other people make about your conduct. Dissonance is a state inside you, and it can be there when nobody is watching and nobody objects.
- Not denial. Denial is one of the defence mechanisms — a specific way of not registering something. Dissonance is the pressure; denial is one possible response to it.
- Not confirmation bias. Confirmation bias is a systematic tendency to seek and weigh evidence that supports what you already think. Dissonance is a felt discomfort. They interact — one common way to reduce dissonance is to go looking for supportive evidence — but a bias in information search is not the same object as an aversive state.
- Not the sunk cost fallacy. Sunk cost is about continuing to invest because of what you have already spent. Dissonance is about how you feel and what you then believe. They co-occur often enough to be confused permanently.
What is still argued about
Six decades of work have not settled why the effect happens, and any honest account says so. Three serious alternatives to Festinger’s original account exist, and each predicts the same one-dollar result for a different reason.
Daryl Bem argued in 1967 that no discomfort is needed at all. On his self-perception account, people infer their attitudes by observing their own behaviour, the way an outsider would: I said it was interesting for a dollar, so I must have found it interesting. Cooper and Fazio proposed in 1984 that what drives the effect is feeling personally responsible for an unwanted consequence, rather than inconsistency as such. Claude Steele’s self-affirmation theory holds that what is being protected is the integrity of the self, not the consistency of two cognitions.
The disagreement is not a sign that the phenomenon is fragile — the induced-compliance result has been produced many times. A 2019 review by Vaidis and Bran argues the real problem is conceptual: the theory is stated loosely enough that different laboratories operationalise dissonance in incompatible ways, which makes replication attempts hard to interpret in either direction. That is a more interesting state of affairs than a settled textbook paragraph, and it is worth knowing before you cite the term in an essay.
Cognitive dissonance, self-perception, self-affirmation and effort justification are four terms that overlap and are not interchangeable — the kind of cluster that is much easier to hold apart when you learn the members against each other rather than one at a time. Cognitive dissonance is the example the dictionary itself opens with, for the same reason it opens this article: it is the term people are most confident they already understand.
Frequently asked questions
What is cognitive dissonance in simple terms?
It is the uncomfortable tension you feel when two of your beliefs, or a belief and something you have done, do not fit together. The discomfort pushes you to change one of them, and usually the belief moves rather than the behaviour, because the behaviour has already happened.
What was the one-dollar, twenty-dollar experiment?
In 1959 Festinger and Carlsmith had students do an hour of boring tasks, then paid them either one dollar or twenty to tell the next participant it had been enjoyable. The one-dollar group later rated the task as genuinely more enjoyable, at +1.35 against −0.05 for the twenty-dollar group.
Why does a smaller reward change attitudes more?
Because a large reward is a sufficient reason for saying something you do not believe, and a small one is not. With twenty dollars there is nothing to explain away. With one dollar the only cheap explanation left is that you must have quite liked the task after all.
Is cognitive dissonance the same as hypocrisy?
No. Hypocrisy is a judgement about somebody’s conduct made from outside. Cognitive dissonance is an internal state, and it does not require an audience, an accusation or any moral failing. You can feel it about which laptop you bought.
How do you reduce cognitive dissonance?
Festinger’s theory names four routes: change the behaviour, change the belief, add a third belief that reconciles the two, or decide the whole matter is unimportant. The theory does not say which one a person will take, only that the least costly change tends to win.
Is cognitive dissonance theory still accepted?
The phenomenon is well established; the explanation is not settled. Self-perception theory, the new-look account and self-affirmation theory each explain the same results differently, and a 2019 review argues the underlying concept needs sharper definition before replication debates can be resolved.
Sources
- 1.Festinger, L. (1957). A Theory of Cognitive Dissonance. Stanford University Press.
- 2.Festinger, L., & Carlsmith, J. M. (1959). Cognitive consequences of forced compliance. Journal of Abnormal and Social Psychology, 58(2), 203–210.
- 3.Aronson, E., & Mills, J. (1959). The effect of severity of initiation on liking for a group. Journal of Abnormal and Social Psychology, 59(2), 177–181.
- 4.Bem, D. J. (1967). Self-perception: An alternative interpretation of cognitive dissonance phenomena. Psychological Review, 74(3), 183–200.
- 5.Cooper, J., & Fazio, R. H. (1984). A new look at dissonance theory. Advances in Experimental Social Psychology, 17, 229–266.
- 6.Steele, C. M. (1988). The psychology of self-affirmation: Sustaining the integrity of the self. Advances in Experimental Social Psychology, 21, 261–302.
- 7.Loughnan, S., Haslam, N., & Bastian, B. (2010). The role of meat consumption in the denial of moral status and mind to meat animals. Appetite, 55(1), 156–159.
- 8.Vaidis, D. C., & Bran, A. (2019). Respectable challenges to respectable theory: Cognitive dissonance theory requires conceptual clarification. Frontiers in Psychology, 10, 1189.