Explain how inconsistent cognitions create dissonance that people are motivated to reduce, describe and evaluate the research behind the theory, and apply it to behaviour in health, relationships, development and learning.
Each is in the Psychology glossary, with every other term in the subject.
A relatively lasting evaluation of a person, object, group or idea, made up of feelings, beliefs and tendencies to behave in a particular way towards it.
An unpleasant state of psychological tension that arises when a person holds two related cognitions, such as a belief and knowledge of their own behaviour, that are inconsistent, which motivates them to reduce the inconsistency.
Any strategy used to lessen cognitive dissonance, such as changing behaviour, changing an attitude or belief, adding consonant cognitions or making the dissonant cognition seem unimportant (trivialisation).
The tendency to value a goal, group or outcome more highly when much effort, cost or suffering was spent reaching it, which reduces dissonance between the effort and a disappointing result.
A technique in which people publicly advocate a behaviour and are then reminded of their own failures to perform it, creating dissonance that is most easily reduced by changing their behaviour.
A dissonance paradigm in which a person is led to act or speak against their own attitude with little external justification, usually leading them to change the attitude to fit the behaviour.
Dissonance that follows a choice between similarly attractive options, usually reduced by rating the chosen option more positively and the rejected option more negatively (the spreading of alternatives).
Describe cognitive dissonance and the three main ways people reduce it.
Explain why cognitive dissonance is studied within the sociocultural approach.
Describe induced compliance, effort justification, post-decision dissonance and hypocrisy induction, with an example of each.
Explain the conditions that make dissonance stronger or weaker, including choice, justification and commitment.
Describe and evaluate the study by Festinger and Carlsmith (1959).
Discuss cultural variation in cognitive dissonance.
Evaluate cognitive dissonance theory with reference to measurement, causality, bias and responsibility.
Apply cognitive dissonance to behaviour in health, relationships, development and learning.
Cognitive dissonance is the discomfort a person feels when two of their beliefs, or a belief and their own behaviour, do not fit together. The theory explains why people who smoke often play down the risks of smoking, why members of demanding groups defend them so strongly, and why people tend to feel more certain about a decision once it has been made.
The theory was proposed by Leon Festinger (1957). It describes a mental process, but the process is usually set off and resolved in social situations: saying something in public, joining a group, being persuaded or making a commitment to others. For this reason it is studied within the sociocultural approach, and it connects closely to compliance techniques, social norms and the influence of culture. Research on it raises questions of measurement, because dissonance cannot be observed directly, of causality, because other theories explain the same results, and of
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Steele’s theory that people can protect a threatened self-image, including reducing dissonance, by affirming another valued part of themselves rather than resolving the original inconsistency.
Bem’s theory that people often infer their own attitudes by observing their own behaviour and its circumstances, as an outside observer would, without needing a state of tension.
Festinger used the word cognition for any piece of knowledge a person holds: a belief (“smoking causes cancer”), an attitude (“I like my school”), a value (“honesty matters”) or knowledge of their own behaviour (“I smoked three cigarettes today”). Most cognitions have nothing to do with each other. When two cognitions are related, they can either fit together or clash.
Relation between two cognitions | Meaning | Example |
|---|---|---|
Consonant | One follows from, or supports, the other | “I revise every evening” and “Revision improves grades” |
Dissonant | One implies the opposite of the other | “I revise very little” and “Revision improves grades” |
Irrelevant | They have no bearing on each other | “I revise very little” and “Lima is the capital of Peru” |
When two related cognitions are dissonant, the person experiences an unpleasant state of tension. Festinger compared it to hunger: it is uncomfortable, so it pushes the person to do something to make it go away. The theory therefore describes a motivational state, not just a logical inconsistency that a person may or may not notice.
Attitudes are central to the theory, because the most common way of reducing dissonance is to change one. An attitude has a feeling part (liking or disliking), a belief part (what the person thinks is true about the object) and a behavioural part (how they tend to act towards it).
Not every inconsistency produces the same amount of discomfort. Festinger proposed that the magnitude of dissonance depends on two things. The first is the importance of the cognitions to the person: an inconsistency about one’s health, honesty or identity matters more than one about which bus to take. The second is the proportion of dissonant to consonant cognitions: a smoker who knows many reasons to stop and few reasons to continue feels more dissonance than one who can list several benefits of smoking.
Later researchers added a third factor. Elliot Aronson argued in the 1960s that dissonance is strongest when the inconsistency threatens a person’s self-concept, especially the belief that they are a good, honest and sensible person. Saying something false to a stranger is uncomfortable mainly because it clashes with “I am an honest person”. This self-concept version of the theory explains why dissonance often feels personal and why people defend their decisions so strongly.
Because dissonance is unpleasant, people are motivated to reduce it. Festinger described three main routes of dissonance reduction, and later research added several others. In each case the person restores consistency, either by changing their behaviour or by changing what they think.
Change the behaviour so that it fits the belief. A smoker who stops smoking removes the dissonant cognition “I smoke”.
Change one of the cognitions so that it fits the behaviour. The smoker decides that “the link between smoking and cancer has been exaggerated”.
Add consonant cognitions or trivialise the dissonant one. The smoker adds “smoking helps me cope with stress” or “my grandfather smoked and lived to ninety”, or decides that the risk does not matter much because “everyone dies of something”.
Changing behaviour is often the hardest route. Behaviour may be habitual, addictive, already completed or witnessed by others, so it cannot easily be undone. Changing a belief is private and costs nothing, so people frequently take that route instead. This is why the theory predicts that people who have acted against their beliefs will often end up believing what they did was right.
People also avoid dissonance before it arises. Selective exposure is the tendency to seek out information that supports what one already believes or does and to avoid information that challenges it. A smoker may skip articles about lung cancer, and a voter may read only news that favours their party. Selective exposure links dissonance to confirmation bias, the tendency to search for and interpret information in ways that confirm existing beliefs.
Two further strategies show how flexible dissonance reduction can be. People can deny responsibility for the behaviour (“I had no choice”), which removes the link between the behaviour and the self. Steele’s self-affirmation theory proposes that people can also reduce dissonance indirectly, by affirming a different valued part of the self (“I may have lied, but I am a kind and generous friend”), which restores a positive self-image without changing the original inconsistency.
YouTubeDissonance is a cognitive process, so it could be taught alongside the cognitive approach. It is placed in the sociocultural approach because the situations that create and resolve it are almost always social. Four features make the social side clear.
Public behaviour creates the strongest dissonance. Saying something to another person, signing a petition or making a promise in front of others commits the person in a way that private thoughts do not.
Groups are a source of dissonance and of its reduction. Joining a group that turns out to be disappointing creates dissonance, and other members’ agreement is one of the most effective ways of reducing it.
Social influence uses dissonance. Several compliance techniques work because people want to stay consistent with what they have already agreed to, and health campaigns deliberately create dissonance to change behaviour.
Culture shapes it. What counts as an inconsistency, and how threatening it is, depends on how a culture defines the self, as research comparing North American and East Asian participants shows.
This placement is also a reminder that the three approaches overlap. Dissonance involves a cognitive process (comparing cognitions), a biological state (arousal and activity in brain regions that monitor conflict) and a social context. Explaining it through only one of these would be reductionism.
Researchers study dissonance through a small number of standard situations, called paradigms. Each creates a different kind of inconsistency and leads to a different, predictable kind of dissonance reduction. Knowing the paradigms makes it easier to recognise dissonance in a new situation.
In induced compliance, a person is persuaded to say or do something that goes against their attitude, with little outside reason for doing so. The cognitions “I said X” and “I believe not-X” are dissonant. Because the behaviour has already happened, the easiest way to reduce the dissonance is to move the attitude towards the behaviour: “perhaps X is partly true”.
The key condition is insufficient justification. If a person is paid well or threatened, the reward or threat explains the behaviour (“I only said it for the money”), so there is little dissonance and little attitude change. If the reward is small, the person has no outside explanation, and the attitude changes more. This prediction is the opposite of what a simple reward-based account would expect, and it was first tested by Festinger and Carlsmith (1959), who paid students either $1 or $20 to describe a boring task as enjoyable.
Dissonance from insufficient justification also works with threats. In a study by Aronson and Carlsmith (1963), preschool children were told not to play with an attractive toy, under either a mild or a severe threat of punishment. Children given the mild threat later rated the toy as less attractive than children given the severe threat, because a mild threat was not enough to explain why they had stayed away from a toy they wanted.
YouTubePeople tend to value something more if they suffered or worked hard to get it. The cognitions “I went through a lot to get this” and “this is disappointing” are dissonant, and the effort cannot be undone, so the person comes to value the goal more highly. This is called effort justification.
Aronson and Mills (1959) tested this with female college students who volunteered to join a discussion group about sex. Before joining, they went through a severe initiation (reading obscene words aloud to a male experimenter), a mild initiation or no initiation. All then heard the same deliberately dull recorded discussion. Those who had gone through the severe initiation rated the discussion and the group members as more interesting than the others did. One alternative explanation is that the embarrassing reading was sexually arousing, but Gerard and Mathewson (1966) found the same effect when the initiation was a series of electric shocks.
Effort justification helps explain why initiation rituals, demanding training and costly memberships often produce strong loyalty. It also has a practical use. Some prevention programmes ask participants to put effort into arguing against a harmful idea, so that the effort itself makes them value the new position more.
Every choice between two attractive options creates some dissonance, known as post-decision dissonance. The chosen option has drawbacks, and the rejected option had good features. People reduce this dissonance after the choice by rating the chosen option more highly and the rejected one less highly than before, an effect called the spreading of alternatives.
Brehm (1956) asked 225 female students to rate household appliances, such as a toaster and a radio, and then let them choose one of two as a gift. When they rated the products again, they rated the chosen product higher and the rejected one lower than before, and the effect was larger when the two options had been close in the first ratings. Egan, Santos and Bloom (2007) found a similar pattern in four-year-old children choosing between stickers and in capuchin monkeys choosing between coloured sweets, which suggests that this form of dissonance reduction does not depend on language or adult reasoning.
The free-choice method has a measurement problem. Chen and Risen (2010) showed that because ratings are imperfect measures of true preference, the classic rate–choose–rate design produces some apparent spreading even if choosing changes nothing. Later studies added control conditions to deal with this, and many still found choice-induced changes, but some earlier findings were overstated.
Dissonance also arises when strong evidence contradicts a belief a person has acted on. Festinger, Riecken and Schachter (1956) joined a small group in the United States whose leader predicted that a flood would destroy the world in December 1954 and that believers would be rescued by a flying saucer. When neither the flood nor the saucer came, the most committed members, who had given up jobs and possessions, did not abandon the belief. They accepted the explanation that their faith had saved the world and began, for the first time, to seek publicity and new members.
Social support from others who share the belief is one of the most effective ways of reducing this kind of dissonance, because every other member who keeps the belief adds a consonant cognition (“all these people still believe it”). Seeking new believers works in the same way, which explains why the group began to look for publicity only after the prophecy failed.
In induced compliance, effort justification, post-decision dissonance and belief disconfirmation, people usually reduce dissonance by changing their minds. Hypocrisy induction is designed so that changing behaviour is the easiest route. A person first argues publicly for a behaviour, and is then reminded of times they have failed to do it themselves. The inconsistency between “what I preach” and “what I do” can be reduced only by doing what they preached, because the public statement cannot be taken back.
Stone et al. (1994) asked sexually active US college students to make a video promoting condom use for high-school students. Some were then asked to list occasions when they had not used condoms themselves. Students in this hypocrisy condition were more likely to buy condoms at the end of the study than students who had only made the video or only recalled their past behaviour. The outcome was a real behaviour, not a questionnaire answer, which makes this one of the strongest demonstrations that dissonance can produce change.
Dissonance research has identified the conditions under which inconsistency produces enough discomfort to change attitudes. They explain why the same behaviour changes some people’s attitudes and not others, and they are the variables that dissonance experiments manipulate.
Condition | Stronger dissonance when… | Example |
|---|---|---|
Justification | There is little outside reason for the behaviour (small reward, mild threat) | Lying for $1 rather than $20 |
Choice | The person feels they chose freely | Agreeing to write an essay when told they may refuse |
Commitment | The behaviour is public and hard to reverse | Signing a public pledge rather than thinking privately |
Consequences | The behaviour has foreseeable negative results for others | Misleading another person who will act on the lie |
Self-relevance | The inconsistency threatens a positive self-image | An honest person lying, a healthy person smoking |
Two of these conditions led to revised versions of the theory. Cooper and Fazio (1984) proposed the “new look” model, in which dissonance is caused less by inconsistency itself than by feeling personally responsible for an unwanted consequence, such as misleading someone. Later research by Eddie Harmon-Jones and colleagues found dissonance even when a counter-attitudinal statement had no negative consequences, which supports Festinger’s original view that inconsistency alone can be enough.
Harmon-Jones’s action-based model offers an explanation of why the process exists at all. Inconsistent cognitions make it harder to act effectively, because they point to different actions. Reducing dissonance clears the way for action, so the motive to restore consistency may be useful rather than a flaw in reasoning.
Festinger described dissonance as uncomfortable, and several lines of research support this. In a study by Zanna and Cooper (1974), participants wrote an essay against their own view after taking a pill that was in fact a placebo. Those told the pill would make them feel tense showed little attitude change, because they could blame their discomfort on the pill. Those told it would relax them showed more attitude change than usual. This suggests that dissonance involves arousal, and that people change their attitudes only when they attribute that arousal to their own behaviour.
Elliot and Devine (1994) measured discomfort directly with a self-report scale. Participants who wrote a counter-attitudinal essay under high choice reported more discomfort, and their discomfort fell once they had changed their attitude. This fits the idea that attitude change works because it reduces an unpleasant feeling.
Brain research adds a biological level. Van Veen et al. (2009) scanned participants with fMRI while they argued that the uncomfortable scanner was a pleasant place to be. Activity in the dorsal anterior cingulate cortex and the anterior insula during the counter-attitudinal statements predicted how much participants’ attitudes changed afterwards. These regions are involved in detecting conflict and in negative feelings, which is consistent with dissonance being a conflict signal. Because fMRI measures blood flow rather than the experience itself, these findings show a correlation with dissonance, not what dissonance is.
Because dissonance is a general process, it helps explain behaviour in each of the four contexts: health and well-being, human relationships, human development, and learning and cognition.
Health behaviours are a common source of dissonance, because most people know the risks of what they do. Fotuhi et al. (2013) used data from the International Tobacco Control Four Country Survey, which followed nationally representative samples of adult smokers in Canada, the USA, the UK and Australia between 2002 and 2004. Smokers who never tried to quit held the most rationalisations for smoking, such as “smoking calms me down” or “the medical evidence is exaggerated”. When smokers quit, their rationalisations decreased, and when they relapsed, the rationalisations returned. Beliefs changed to fit behaviour, as the theory predicts.
Dissonance can also be used to protect health. The Body Project is a group programme for adolescent girls and young women in which participants argue against the thin body ideal through speeches, letters and role-plays. Because they voluntarily speak against an ideal they may hold, they experience dissonance that is reduced by rejecting the ideal. In a randomised controlled trial with 481 adolescent girls who were dissatisfied with their bodies, Stice et al. (2008) found that participants in the dissonance programme showed a 60% lower risk of developing eating disorder symptoms over three years than an assessment-only control group.
Effort justification helps explain why people stay loyal to demanding groups, from sports teams with harsh training to organisations with initiation rituals. The more a person has invested in a group, the more dissonance a negative view of it would create, so members tend to defend the group and play down its faults. The same reasoning applies to close relationships: a person who has given up a lot for a relationship has a strong motive to see it positively. Belief disconfirmation research shows the social side of reduction, since group members reduce dissonance by supporting each other’s beliefs.
Studies with young children show that dissonance reduction appears early in development. Four-year-olds in the study by Egan, Santos and Bloom (2007) devalued stickers they had not chosen, and preschoolers in the study by Aronson and Carlsmith (1963) devalued a toy they had avoided under a mild threat. The second finding has a practical lesson for parents and teachers: mild requests may lead children to adopt a rule as their own, while severe threats explain the behaviour from outside and may change only behaviour, not attitudes.
Dissonance affects how people process information and make decisions. Selective exposure and post-decision justification mean that people often become more confident after a decision than before it, even without new information. In learning, students who have invested effort in a method of study may defend it even when evidence suggests it is ineffective. This links dissonance to decision-making and to cognitive biases such as confirmation bias.
Context | Example of dissonance | Typical reduction |
|---|---|---|
Health and well-being | Smoking while knowing the risks | Rationalising beliefs, which fall when smokers quit |
Health and well-being | Arguing against the thin ideal in the Body Project | Rejecting the thin ideal; fewer eating disorder symptoms |
Human relationships | Effort spent to join a group that disappoints | Valuing the group more (effort justification) |
Human development | Avoiding a toy under a mild threat | Devaluing the forbidden toy |
Learning and cognition | Choosing between two similar options | Spreading of alternatives; selective exposure |
Most early dissonance research was carried out with North American university students, so whether the theory applies across cultures is an important question. Cross-cultural research suggests that dissonance occurs everywhere, but that culture shapes which inconsistencies are threatening and when people try to reduce them.
Heine and Lehman (1997) compared Canadian and Japanese students in the free-choice paradigm. Participants ranked a set of music CDs, chose one of two they had ranked similarly, and ranked them again later. Canadians showed the usual spreading of alternatives, while Japanese participants showed no dissonance reduction. The researchers suggested that a poor personal choice threatens the self far more where people have an independent self-construal, seeing the self as separate and unique, than where they have an interdependent self-construal, defining the self through relationships with others.
Hoshino-Browne et al. (2005) extended this work. European Canadians justified their choices more when they had chosen for themselves, while Asian Canadians and Japanese participants justified their choices more when they had chosen for a friend. In an interdependent culture, a poor choice for a friend threatens what matters most, the relationship and one’s standing in it. The same process occurs in both cultural groups, but it is set off by different situations.
These findings matter for applications. A health campaign that points out personal hypocrisy (a gap between what an individual says about their own health and what they do) may work best where the self is defined independently, while one that highlights the effect of behaviour on family or community may create more dissonance where the self is interdependent. The cultural studies themselves compared groups of university students, so they say more about differences in self-construal than about whole nations.
Cognitive dissonance is one of the most influential theories in social psychology, but its evidence base has important limits. The six concepts provide a structure for evaluating it.
Dissonance is a construct: it cannot be seen, so researchers infer it from something they can measure. Most studies operationalise it indirectly, as the size of an attitude change after a counter-attitudinal act. This is circular if it is the only evidence, because the theory predicts attitude change and then uses attitude change as proof that dissonance occurred. Self-report scales of discomfort, as used by Elliot and Devine (1994), physiological arousal and brain imaging, as used by van Veen et al. (2009), give more direct measures, and the fact that they point in the same direction strengthens the theory through triangulation.
The way dissonance is induced also varies widely between studies, including essays, lies, choices and initiations. This lack of standardisation makes results hard to compare and was one of the reasons for a large multi-lab replication.
Many dissonance studies are laboratory experiments with random allocation to conditions, such as high versus low reward, which supports causal conclusions about what produces attitude change. The question is whether dissonance is the cause. Bem’s (1967) self-perception theory offers a different explanation of the same results.
Bem argued that a person paid $1 to say a task was fun simply looks at their own behaviour and concludes, as an observer would, that they must have found it reasonably enjoyable. The two theories make the same prediction about attitudes, so attitude change alone cannot decide between them. Studies showing that arousal is present and that misattributing it removes the attitude change, as in the pill study by Zanna and Cooper (1974), support dissonance theory where attitudes are strongly held. Many researchers now accept that self-perception explains attitude change for weak or unclear attitudes, and dissonance for important ones.
A major challenge came from a replication. Vaidis et al. (2024) ran an induced-compliance study in 39 laboratories in 19 countries with 4,898 participants, who wrote a counter-attitudinal essay under high or low choice, or a neutral essay. Writing a counter-attitudinal essay did shift attitudes compared with a neutral essay, but high choice produced no more attitude change than low choice, which contradicts the paradigm’s central prediction. Critics replied that the manipulation of choice may not have worked in every laboratory, so the debate continues, but the study shows that some classic findings are less replicable than textbooks once assumed.
The classic studies used small samples of American university students, often only men, as in Festinger and Carlsmith (1959), or only women, as in Aronson and Mills (1959) and Brehm (1956). These are WEIRD samples, and cross-cultural research on post-decision dissonance shows that the conditions producing dissonance are not the same everywhere, so findings cannot simply be generalised.
A second problem is that the theory is very flexible. Because dissonance can be reduced in many ways, almost any outcome can be explained after the event: if a smoker quits, they changed their behaviour; if they continue, they changed a belief. A theory that can explain every result is hard to falsify. Stronger studies, such as hypocrisy induction, set up the situation so that only one route is likely and then test a specific prediction.
Most dissonance experiments depend on deception. Participants are misled about the purpose of the study, and in induced-compliance studies they are persuaded to mislead someone else. This raises issues of informed consent and of protection from harm, since participants may later feel embarrassed about what they said. Debriefing is essential, and modern ethics committees would ask whether the same questions could be answered with less deception.
Using dissonance deliberately to change behaviour raises a different question. Hypocrisy induction and the Body Project change people’s behaviour by making them uncomfortable. When people take part voluntarily and the goal benefits them, as in eating disorder prevention, this is widely accepted. The same technique used in sales or political persuasion, without people knowing, would be manipulation.
Dissonance is unusual in predicting both change and resistance to change. It explains why people defend unhealthy habits and failed predictions, and it offers practical tools for changing behaviour, which have been tested in randomised trials. The applied research has the strongest evidence, because it measures real behaviour over time rather than a rating made minutes after an experiment.
Concept | Strength of the theory or evidence | Limitation |
|---|---|---|
Measurement | Self-report discomfort, arousal and fMRI findings support the construct | Usually inferred from attitude change, which is partly circular |
Causality | Controlled experiments with random allocation | Self-perception theory explains the same results; Vaidis et al. (2024) did not replicate the effect of choice |
Bias | Cross-cultural studies have tested its limits | WEIRD, single-sex student samples; the theory can explain almost any outcome |
Responsibility | Debriefing used; applications such as the Body Project benefit participants | Heavy use of deception; risk of manipulation in applied use |
Change | Explains rationalisation and supports tested interventions | Most laboratory studies measure short-term attitudes only |
Festinger and Carlsmith aimed to test the prediction of cognitive dissonance theory that people who are induced to say something they do not believe will change their private attitude more when they are given less justification for saying it.
The study was a laboratory experiment with an independent samples design. Participants were 71 male students on an introductory psychology course at Stanford University in the United States, who were obliged to take part in research as part of their studies. Each spent an hour on two deliberately boring tasks: putting 12 spools onto a tray, emptying it and filling it again for 30 minutes, then turning each of 48 square pegs a quarter turn, over and over, for another 30 minutes.
Participants were then allocated to one of three conditions. In the two experimental conditions, the experimenter explained that his assistant had not turned up and asked the participant to take the assistant’s place by telling the next participant, who was waiting outside, that the tasks were interesting, enjoyable and fun. He paid them either $1 or $20 for doing so. The waiting “participant” was a female confederate, who said a friend had told her the experiment was boring and then accepted whatever the participant said. Participants in the control condition did the tasks but were not asked to say anything to her.
Afterwards, all participants were interviewed by a different person, apparently as part of a separate department survey of experiments. The dependent variable was their answer to the question of how interesting and enjoyable the tasks had been, on a scale from −5 (extremely dull and boring) to +5 (extremely interesting and enjoyable). Eleven participants were excluded, for example because they suspected the real purpose, told the confederate the truth or refused the money, leaving 20 in each condition.
Participants paid $1 rated the tasks as more enjoyable (mean +1.35) than participants paid $20 (−0.05) or control participants (−0.45). The difference between the $1 group and the others was statistically significant. The $1 group also said they were more willing to take part in a similar experiment again, although this difference was less reliable statistically. Ratings of how much participants had learned about their own abilities did not differ between conditions, which suggests that the payment affected attitudes to the tasks specifically rather than the participants’ mood in general.
Telling someone that a boring task was fun created dissonance between “I said the tasks were enjoyable” and “the tasks were boring”. For participants paid $20, the money was sufficient justification for the lie, so there was little dissonance to reduce. For participants paid $1, the payment was too small to explain the lie, so they reduced the dissonance by changing their attitude: the tasks “weren’t that bad after all”. The study supported the theory’s prediction that the smaller the justification for a counter-attitudinal act, the greater the attitude change, which was the opposite of what a reward-based account would predict.
Because the size of the payment was manipulated and a control condition was included, the difference in ratings can reasonably be attributed to the level of justification. However, attitude change is also predicted by self-perception theory, and the larger payment ($20 was a considerable sum in 1959) may itself have made the request seem suspicious, which is a possible confounding variable. The 2024 multi-lab replication by Vaidis and colleagues, using a different induced-compliance procedure, did not confirm the role of choice, which weakens confidence in this paradigm.
Dissonance was never measured directly. It was inferred from a single rating on an 11-point scale, given minutes after the lie. The interview was cleverly presented as unrelated to the experiment, which reduced demand characteristics, but one rating cannot show how strong or long-lasting the attitude change was. The exclusion of 11 participants, all of them from the two experimental conditions, may also have removed people who reacted differently.
The sample was 71 male American students from one university who were obliged to take part, so the findings may not generalise to women, older adults or people from cultures where the self is defined interdependently. Later cross-cultural research suggests that the situations that produce dissonance vary with culture.
Participants were deceived about the purpose of the study, about the missing assistant and about the separate interview, and they were persuaded to mislead another student. They were fully debriefed at the end, but the procedure would require careful justification to an ethics committee today.
Sources: Festinger, L., & Carlsmith, J. M. (1959). Cognitive consequences of forced compliance. _Journal of Abnormal and Social Psychology, 58(2), 203–210._
Paper 1 Section B gives an unseen scenario from one of the four contexts and asks how a term could explain or change the behaviour in it. The answer must use the details of the scenario throughout.
Cognitive dissonance is an unpleasant state of tension caused by holding inconsistent cognitions, which motivates people to reduce the inconsistency.
People reduce dissonance by changing behaviour, changing a cognition, or adding consonant cognitions and trivialising dissonant ones; changing a belief is often easier than changing behaviour.
Dissonance is strongest when the behaviour is freely chosen, poorly justified, public, has negative consequences and threatens the self-concept.
The main paradigms are induced compliance, effort justification, post-decision dissonance, belief disconfirmation and hypocrisy induction.
Festinger and Carlsmith (1959) found that students paid $1 to lie about a boring task rated it as more enjoyable (+1.35) than those paid $20 (−0.05) or controls (−0.45).
Hypocrisy induction and dissonance-based programmes such as the Body Project use dissonance to change health behaviour.
Dissonance appears across cultures, but culture shapes which inconsistencies threaten the self, as Heine and Lehman (1997) and Hoshino-Browne et al. (2005) showed.
Evaluation: dissonance is usually inferred from attitude change, self-perception theory explains the same results, classic samples were WEIRD, many studies used deception, and a 2024 multi-lab replication did not find the predicted effect of choice.
I can describe cognitive dissonance and the main ways people reduce it.
I can explain why cognitive dissonance is studied within the sociocultural approach.
I can describe induced compliance, effort justification, post-decision dissonance and hypocrisy induction, with an example of each.
I can explain how choice, justification, commitment and self-relevance affect the strength of dissonance.
I can describe and evaluate Festinger and Carlsmith (1959).
I can discuss how culture affects when dissonance occurs.
I can evaluate dissonance theory with reference to measurement, causality, bias and responsibility.
I can apply cognitive dissonance to a scenario in health, relationships, development or learning.