False consensus effect
In psychology, the false consensus effect, also known as consensus bias, is a pervasive cognitive bias in social inferences, which people tend to “see their own behavioral choices and judgements as relatively common and appropriate to existing circumstances”. In other words, it is perceivers’ tendency to assume that their personal qualities, characteristics, beliefs, and actions are relatively widespread through the general population in any given situations. The false consensus effect has been widely observed and supported by empirical evidence. Previous research has suggested that cognitive and perceptional factors (e.g. motivated projection, accessibility of information, emotion, etc.) may contribute to the consensus bias, while recent studies have focused on its neural mechanisms. One recent study has shown that the consensus bias may improve decisions about other people's preferences.
Ross, Green and House firstly defined the false consensus effect in 1977 with emphasis on the relative commonness that people perceive about their own responses; however, similar projection phenomena had already caught attention in psychology. Specifically, concerns with respect to connections between individual’s personal predispositions and their estimates of peers appeared in the literature for a while. For instances, Katz and Allport in 1931 illustrated that students’ estimates of the amount of others on the frequency of cheating was positively correlated to their own behavior. Later, around 1970, same phenomena were found on political beliefs and prisoner’s dilemma situation. In 2017, researchers identified a persistent egocentric bias when participants learned about other people's snack-food preferences.
This false consensus is significant because it increases or decreases self-esteem, the overconfidence effect or a belief that everyone knows one's own knowledge. It can be derived from a desire to conform and be liked by others in a social environment. This bias is especially prevalent in group settings where one thinks the collective opinion of their own group matches that of the larger population. Since the members of a group reach a consensus and rarely encounter those who dispute it, they tend to believe that everybody thinks the same way. The false-consensus effect is not restricted to cases where people believe that their values are shared by the majority, but it still manifests as an overestimate of the extent of their belief.
Additionally, when confronted with evidence that a consensus does not exist, people often assume that those who do not agree with them are defective in some way. There is no single cause for this cognitive bias; the availability heuristic, self-serving bias, and naïve realism have been suggested as at least partial underlying factors. The bias may also result, at least in part, from non-social stimulus-reward associations. Maintenance of this cognitive bias may be related to the tendency to make decisions with relatively little information. When faced with uncertainty and a limited sample from which to make decisions, people often "project" themselves onto the situation. When this personal knowledge is used as input to make generalizations, it often results in the false sense of being part of the majority.[clarification needed]
The false-consensus effect can be contrasted with pluralistic ignorance which happens when members of group privately vary in expectations or disagree with group's norm but feel different from the rest of the group and publicly act similarly as them.
Contrasted with pluralistic ignorance
The false-consensus effect can be contrasted with pluralistic ignorance, an error in which people privately disapprove but publicly support what seems to be the majority view (regarding a norm or belief), when the majority in fact shares their (private) disapproval. While the false-consensus effect leads people to wrongly believe that the majority agrees with them (when the majority, in fact, openly disagrees with them), the pluralistic ignorance effect leads people to wrongly believe that they disagree with the majority (when the majority, in fact, covertly agrees with them). However, the false consensus effect does not deny that pluralistic ignorance could result in biased estimates by minority and majority as well. For example, the probability of intimate partner violence occurred might be underestimated by abusing partner and nonabusing partner alike. The false consensus effect would only reveal that abusing partners perceive intimate partner violence to be more common than do nonabusing partners.
Major theoretical approaches
The false-consensus effect can be traced back to two parallel theories of social perception, "the study of how we form impressions of and make inferences about other people". The first is the idea of social comparison. The principal claim of Leon Festinger's (1954) social comparison theory was that individuals evaluate their thoughts and attitudes based on other people. This may be motivated by a desire for confirmation and the need to feel good about oneself. As an extension of this theory, people may use others as sources of information to define social reality and guide behavior. This is called informational social influence. The problem, though, is that people are often unable to accurately perceive the social norm and the actual attitudes of others. In other words, research has shown that people are surprisingly poor "intuitive psychologists" and that our social judgments are often inaccurate. This finding helped to lay the groundwork for an understanding of biased processing and inaccurate social perception. The false-consensus effect is just one example of such an inaccuracy.
The second influential theory is projection, the idea that people project their own attitudes and beliefs onto others. This idea of projection is not a new concept. In fact, it can be found in Sigmund Freud's work on the defense mechanism of projection, D.S. Holmes' work on "attributive projection" (1968), and Gustav Ichheisser's work on social perception (1970). D.S. Holmes, for example, described social projection as the process by which people "attempt to validate their beliefs by projecting their own characteristics onto other individuals".
Here a connection can be made between the two stated theories of social comparison and projection. First, as social comparison theory explains, individuals constantly look to peers as a reference group and are motivated to do so in order to seek confirmation for their own attitudes and beliefs. In order to guarantee confirmation and a higher self-esteem, though, an individual might unconsciously project their own beliefs onto the others (the targets of their comparisons). This final outcome is the false-consensus effect. To summarize, the false-consensus effect can be seen as stemming from both social comparison theory and the concept of projection.
The false-consensus effect, as defined by Ross, Greene, and House in 1977, came to be the culmination of the many related theories that preceded it. In their well-known series of four studies, Ross and associates hypothesized and then demonstrated that people tend to overestimate the popularity of their own beliefs and preferences. Studies were both conducted in hypothetical situations by questionnaire surveys and in authentic conflict situations. For questionnaire studies, participants were presented with hypothetical events and then were not only asked to indicate their own behavioral choices and characteristics under the provided circumstances, but also asked to rate the responses and traits of their peers who referred as "actors". As for real occasion studies, participants were actually confronted with the conflict situations in which they were asked to choice behavioral alternatives and to judge the traits as well as decisions of two supposedly true individuals who had attended in the study.  In general, the raters made more "extreme predictions" about the personalities of the actors that did not share the raters' own preference. In fact, the raters may have even thought that there was something wrong with the people expressing the alternative response.
In the ten years after the influential Ross et al. study, close to 50 papers were published with data on the false-consensus effect. Theoretical approaches were also expanded. The theoretical perspectives of this era can be divided into four categories: (a) selective exposure and cognitive availability, (b) salience and focus of attention, (c) logical information processing, and (d) motivational processes. In general, the researchers and designers of these theories believe that there is not a single right answer. Instead, they admit that there is overlap among the theories and that the false-consensus effect is most likely due to a combination of these factors.
Selective exposure and cognitive availability
This theory is closely tied to the availability heuristic, which suggests that perceptions of similarity (or difference) are affected by how easily those characteristics can be recalled from memory. And as one might expect, similarities between oneself and others are more easily recalled than differences. This is in part because people usually associate with those who are similar to themselves. This selected exposure to similar people may bias or restrict the "sample of information about the true diversity of opinion in the larger social environment". As a result of the selective exposure and availability heuristic, it is natural for the similarities to prevail in one's thoughts.
Botvin et al. (1992) did a popular study on the effects of the false-consensus effect among a specific adolescent community in an effort to determine whether students show a higher level of false-consensus effect among their direct peers as opposed to society at large. The participants of this experiment were 203 college students ranging in age from 18 to 25 (with an average age of 18.5). The participants were given a questionnaire and asked to answer questions regarding a variety of social topics. For each social topic, they were asked to answer how they felt about the topic and to estimate the percentage of their peers who would agree with them. The results determined that the false-consensus effect was extremely prevalent when participants were describing the rest of their college community; out of twenty topics considered, sixteen of them prominently demonstrated the false-consensus effect. The high levels of false-consensus effect seen in this study can be attributed to the group studied; because the participants were asked to compare themselves to a group of peers that they are constantly around (and view as very similar to themselves), the levels of false-consensus effect increased.
Salience and focus of attention
This theory suggests that when an individual focuses solely on their own preferred position, they are more likely to overestimate its popularity, thus falling victim to the false-consensus effect. This is because that position is the only one in their immediate consciousness. Performing an action that promotes the position will make it more salient and may increase the false-consensus effect. If, however, more positions are presented to the individual, the degree of the false-consensus effect might decrease significantly.
Logical information processing
This theory assumes that active and seemingly rational thinking underlies an individual's estimates of similarity among others. This is manifested in one's causal attributions. For instance, if an individual makes an external attribution for their belief, the individual will likely view his or her experience of the thing in question as merely a matter of objective experience. For example, a few movie-goers may falsely assume that the quality of the film is a purely objective entity. To explain their dissatisfaction with it, the viewers may say that it was simply a bad movie (an external attribution). Based on this (perhaps erroneous) assumption of objectivity, it seems rational or "logical" to assume that everyone else will have the same experience; consensus should be high. On the other hand, someone in the same situation who makes an internal attribution (perhaps a film aficionado who is well-aware of his or her especially high standards) will realize the subjectivity of the experience and will be drawn to the opposite conclusion; their estimation of consensus with their experience will be much lower. Although they result in two opposite outcomes, both paths of attribution rely on an initial assumption which then leads to a "logical" conclusion. By this logic, then, it can be said that the false-consensus effect is really a reflection of the fundamental attribution error (specifically the actor-observer bias), in which people prefer external/situational attributions over internal/dispositional ones to justify their own behaviors.
In a study done by Fox, Yinon, and Mayraz, researchers were attempting to determine whether or not the levels of the false-consensus effect changed in different age groups. In order to come to a conclusion, it was necessary for the researchers to split their participants into four different age groups. Two hundred participants were used, and gender was not considered to be a factor. Just as in the previous study mentioned, this study used a questionnaire as its main source of information. The results showed that the false-consensus effect was extremely prevalent in all groups, but was the most prevalent in the oldest age group (the participants who were labeled as "old-age home residents"). They showed the false-consensus effect in all 12 areas that they were questioned about. The increase in false-consensus effect seen in the oldest age group can be accredited to their high level of "logical" reasoning behind their decisions; the oldest age group has obviously lived the longest, and therefore feels that they can project their beliefs onto all age groups due to their (seemingly objective) past experiences and wisdom. The younger age groups cannot logically relate to those older to them because they have not had that experience and do not pretend to know these objective truths. These results demonstrate a tendency for older people to rely more heavily on situational attributions (life experience) as opposed to internal attributions.
This theory stresses the benefits of the false-consensus effect: namely, the perception of increased social validation, social support, and self-esteem. It may also be useful to exaggerate similarities in social situations in order to increase liking. It is possible that these benefits serve as positive reinforcement for false-consensus thinking.
Relation to personality psychology
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Within the realm of personality psychology, the false-consensus effect does not have significant effects. This is because the false-consensus effect relies heavily on the social environment and how a person interprets this environment. Instead of looking at situational attributions, personality psychology evaluates a person with dispositional attributions, making the false-consensus effect relatively irrelevant in that domain. Therefore, a person's personality potentially could affect the degree to which the person relies on false-consensus effect, but not the existence of such a trait. This should not, however, be interpreted as an individual being the sole product of the social environment. In order for the trait to "exist" in an organism's mind, there must be a biological structure that underpins it. For an organism to visibly see ultraviolet light, they must have genes (which then give rise to the biological structure) that allows them to see the external environment. Since the brain is a biological system, there must be an underlying biological disposition that similarly allows an individual to register and interpret the social environment, thus generating the false-consensus effect. The brain's purpose is, after all, to extract information from the environment and accordingly generate behaviour and regulate physiology. There is no distinction between "innate" or "learned", or "nature" versus "nurture" as the interaction of both are needed; it does not sit along a dimension nor is it to be distinguished from each other. Social and personality psychology are not separate fields, but necessarily complementary fields, as demonstrated by the person-situation debate.
Belief in a favorable future
The concept of false consensus effect can also be extended to predictions about future others. Belief in a favorable future is the belief that future others will change their preferences and beliefs in alignment with one's own. Belief in a favorable future suggests that people overestimate the extent to which other people will come to agree with their preferences and beliefs over time.
Rogers, Moore, and Norton (2017) find that belief in a favorable future is greater in magnitude than the false-consensus effect for two reasons:
- It is based in future others whose beliefs are not directly observable, and
- It is focused on future beliefs, which gives these future others time to “discover” the truth and change their beliefs.
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The false-consensus effect is an important attribution bias to take into consideration when conducting business and in everyday social interactions. Essentially, people are inclined to believe that the general population agrees with their opinions and judgments. Whether this belief is accurate, it gives them a feeling of more assurance and security in their decisions. This could be an important phenomenon to either exploit or avoid in business dealings.
For example, if a man doubted whether he wanted to buy a new tool, breaking down his notion that others agree with his doubt would be an important step in persuading him to purchase it. By convincing the customer that other people in fact do want to buy the appliance, the seller could perhaps make a sale that he would not have made otherwise. In this way, the false-consensus effect is closely related to conformity, the effect in which an individual is influenced to match the beliefs or behaviors of a group. There are two differences between the false-consensus effect and conformity: most importantly, conformity is matching the behaviors, beliefs, or attitudes of a real group, while the false-consensus effect is perceiving that others share your behaviors, beliefs, or attitudes, whether or not they really do. Making the customer feel like the opinion of others (society) is to buy the appliance will make the customer feel more confident about his purchase and will make him believe that other people would have made the same decision.
Similarly, any elements of society affected by public opinion—e.g., elections, advertising, publicity—are very much influenced by the false-consensus effect. This is partially because the way in which people develop their perceptions involves "differential processes of awareness". That is to say, while some people are motivated to reach correct conclusions, others may be motivated to reach preferred conclusions. Members of the latter category will more often experience the false-consensus effect, because the subject is likely to search actively for like-minded supporters and may discount or ignore the opposition.
There is ambiguity about several facets of the false-consensus effect and of its study. First of all, it is unclear exactly which factors play the largest role in the strength and prevalence of the false-consensus effect in individuals. For example, two individuals in the same group and with very similar social standing could have very different levels of false-consensus effect, but it is unclear what social, personality, or perceptual differences between them play the largest role in causing this disparity.
Additionally, it can be difficult to obtain accurate survey data about the false-consensus effect (as well as other psychological biases) because the search for consistent, reliable groups to be surveyed (often over an extended period of time) often leads to groups that might have dynamics slightly different from those of the "real world". For example, many of the referenced studies in this article examined college students, who might have an especially high level of false-consensus effect both because they are surrounded by their peers (and perhaps experience the availability heuristic) and because they often assume that they are similar to their peers. This may result in distorted data from some studies of the false-consensus effect.
- Attribution bias – The systematic errors made when people evaluate their own and others' behaviors
- Confirmation bias – Tendency of people to favor information that confirms their beliefs or hypotheses
- False-uniqueness effect
- Fundamental attribution error
- Illusory superiority – Overestimating one's abilities and qualifications; a cognitive bias
- List of cognitive biases – Systematic patterns of deviation from norm or rationality in judgment
- Omission bias
- Overconfidence effect – Bias in which a person's subjective confidence in their judgement is greater than the objective accuracy of those judgements
- Pluralistic ignorance
- Psychological projection – Psychological defense mechanism of blaming one's impulses, qualities and actions on others.
- "The Engineering of Consent"
- Manufacturing Consent
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