Prejudice and Discrimination

1. Definitions: Prejudice, Stereotypes, Discrimination

These three terms are often used loosely, but psychologists distinguish them carefully because they refer to different things: a belief, an attitude, and a behavior.

Stereotypes

A stereotype is a generalized belief about the characteristics, attributes, or behaviors of members of a social group. Stereotypes are the cognitive component—the mental shorthand that says "people in group X tend to be Y." They are a normal byproduct of how the mind simplifies a complex social world. The problem is not that stereotypes exist but that they are applied rigidly to individuals, exaggerate differences between groups, minimize variation within groups, and resist correction even when contradicted by evidence.

Prejudice

Prejudice is a prejudgment—literally, pre-judging—and refers to an attitude (usually negative) toward people simply because they belong to a particular group. Gordon Allport, whose 1954 book The Nature of Prejudice remains foundational, defined it as "an antipathy based upon a faulty and inflexible generalization." Prejudice carries an emotional charge: dislike, contempt, fear, or disgust directed at a group and its members. Where stereotypes supply the content, prejudice supplies the feeling.

Discrimination

Discrimination is the behavioral expression: unequal, unfair, or harmful treatment of individuals based on their group membership rather than their personal qualities. It ranges from subtle slights and avoidance to exclusion, harassment, violence, and systematic denial of rights and resources. Importantly, discrimination does not always flow from personal prejudice—institutional rules and routines can produce discriminatory outcomes even when no individual intends harm.

The relationship among the three is not lockstep. A person can hold a stereotype without strong prejudice, feel prejudice without acting on it, or participate in discriminatory systems without consciously prejudiced attitudes. Social norms, laws, and situational pressures all influence whether attitudes translate into action.

2. The Components of Prejudice

Psychologists frequently analyze prejudice using the same three-part model used for attitudes generally—the cognitive, affective, and behavioral components, sometimes called the ABC model.

Cognitive Component

This is the stereotype: the set of beliefs and expectations a person holds about a group. Cognitive processes such as categorization, illusory correlation (perceiving a relationship between group membership and behavior that does not exist), and confirmation bias all help stereotypes form and persist. Because these are general features of human thinking, they connect prejudice to the broader study of cognitive biases.

Affective Component

This is the emotional reaction—the feelings of liking or disliking, comfort or threat, that a group evokes. Affect is often the most powerful driver of prejudiced behavior. Research on emotions and intergroup attitudes shows that different prejudices carry different emotional signatures: some out-groups elicit fear, others contempt, others pity, and these distinct emotions predict distinct kinds of behavior toward those groups.

Behavioral Component

This is the predisposition to act—the readiness to approach, avoid, help, or harm members of a group. When this predisposition is enacted, it becomes discrimination. Whether it is enacted depends heavily on context, opportunity, and the perceived social acceptability of acting on one's attitudes.

3. Key Theories and Researchers

No single theory explains prejudice. The field has developed several complementary frameworks, each emphasizing a different driver—personality, group competition, social identity, or ordinary cognition.

The Authoritarian Personality

In the aftermath of World War II, Theodor Adorno and colleagues proposed that prejudice reflects a particular personality structure shaped by harsh, rigid upbringing. The "authoritarian personality" was said to be submissive to authority, hostile toward those seen as deviant or inferior, and rigidly conventional. While the original measurement (the F-scale) was criticized on methodological grounds, the core idea survives in modern research on right-wing authoritarianism and social dominance orientation, which reliably predict prejudice across many target groups.

Realistic Conflict Theory

Realistic conflict theory holds that prejudice grows out of real or perceived competition between groups over limited resources—jobs, land, power, status. The classic demonstration is Muzafer Sherif's Robbers Cave experiment, in which boys at a summer camp, divided into two groups and placed in competition, rapidly developed hostility, name-calling, and aggression toward the rival group. Crucially, Sherif also showed how to reverse the hostility—by introducing superordinate goals that required the groups to cooperate. The study remains a cornerstone illustration of how intergroup conflict and its resolution work.

Social Identity Theory

Henri Tajfel and John Turner argued that prejudice does not require real competition at all. Their social identity theory proposes that people derive part of their self-esteem from the groups they belong to, and are therefore motivated to see their in-group as superior to relevant out-groups. In Tajfel's "minimal group" studies, participants assigned to groups on entirely trivial bases—even a coin flip or a meaningless preference—still favored their own group when distributing rewards. This in-group bias shows that the mere act of categorizing people into "us" and "them" is enough to seed favoritism. The theory connects closely to the broader study of group dynamics.

The Cognitive Approach: Categorization and Stereotyping

A later and now-dominant strand treats stereotyping as a more-or-less inevitable consequence of normal cognition. The mind categorizes constantly because it cannot process every individual from scratch. Once people are sorted into categories, we tend to exaggerate similarities within a group and differences between groups, and to see out-group members as more interchangeable than in-group members (the "out-group homogeneity effect"). On this view, prejudice is partly the dark side of an efficient cognitive system—which is why it is so widespread and so resistant to simple appeals to reason.

Scapegoat and Frustration-Aggression

An older but still relevant idea holds that prejudice can serve as a release valve: when people are frustrated and cannot strike at the true source of their difficulties, they may displace hostility onto a vulnerable, visible out-group. Historical episodes of aggression against minorities during economic crises are often cited as examples of scapegoating, though the relationship is complex and not reducible to frustration alone.

4. Causes: Why Prejudice Forms

Drawing the theories together, prejudice has no single cause but several reinforcing roots.

Cognitive Roots

Categorization is automatic and useful, but it produces in-group/out-group distinctions, homogeneity perceptions, and stereotypes as side effects. Once a stereotype exists, confirmation bias and selective memory help it survive contradictory evidence.

Motivational Roots

People are motivated to feel good about themselves and the groups they belong to, to reduce uncertainty, and to justify existing social arrangements. System-justification and social-dominance motives can make unequal hierarchies feel natural and deserved, sustaining prejudice toward lower-status groups.

Social and Competitive Roots

Real competition over jobs, housing, or political power intensifies intergroup hostility, as realistic conflict theory predicts. Even perceived competition—the belief that another group threatens one's resources, safety, or values—is enough to heighten prejudice.

Learned and Cultural Roots

Much prejudice is simply learned. Children absorb attitudes from parents, peers, media, and the surrounding culture, often before they can evaluate them critically. Social learning theory explains how prejudiced attitudes and behaviors are modeled and reinforced across generations, and why prejudice varies so much across cultures and historical periods. Comparative work in cross-cultural psychology shows that which groups are targeted, and how intensely, depends heavily on local history and norms.

5. Forms of Discrimination

Individual vs. Institutional

Individual discrimination is the unequal treatment of one person by another—a landlord who refuses a tenant, a manager who passes over a qualified candidate. Institutional discrimination is built into the laws, policies, and routine practices of organizations and societies, producing unequal outcomes even without any individual intending to discriminate. A hiring algorithm trained on biased historical data, or a school-funding formula tied to local property values, can perpetuate inequality structurally.

Overt vs. Subtle

Overt discrimination is open and deliberate. Subtle or "modern" forms are harder to detect: avoidance, lower warmth, withheld opportunities, and the accumulation of small slights sometimes called microaggressions. As open expression of prejudice has become socially less acceptable in many settings, researchers have documented a shift toward these more covert and deniable forms.

Hostile vs. Benevolent

Not all prejudice looks hostile. Research on sexism, for example, distinguishes hostile prejudice from "benevolent" prejudice that appears positive—protective, idealizing—but still confines a group to a narrow role and rests on the assumption that its members are weaker or less competent. Benevolent prejudice can be especially insidious because it feels like affection rather than antipathy.

6. Examples and Manifestations

Prejudice and discrimination appear across nearly every domain of social life:

• Employment: field experiments using matched résumés that differ only in a name signaling race or gender have repeatedly found unequal callback rates for otherwise identical applicants.
• Housing and lending: differential treatment of applicants by race or ethnicity, sometimes embedded in historical policies whose effects persist long after the policies end.
• Healthcare: documented disparities in pain treatment and diagnosis linked to patient race and gender, partly attributable to clinician stereotypes.
• Education: lowered expectations for students from stigmatized groups can become self-fulfilling, shaping the attention and encouragement those students receive.
• Everyday interaction: avoidance, suspicion, exclusion, and microaggressions that, while individually small, accumulate into a chronic burden for targets.

Prejudice also intersects with how people explain others' behavior. The fundamental attribution error and the "ultimate attribution error" describe how negative out-group behavior tends to be attributed to character ("that's just how they are") while the same behavior by in-group members is excused as situational—a pattern that hardens stereotypes over time.

7. Measuring Prejudice and Bias

Explicit Measures

The most direct approach is to ask people what they think—through attitude surveys, feeling thermometers, and questionnaires. These work well when respondents are willing to report honestly, but they are vulnerable to social-desirability pressure: people often under-report attitudes they know are frowned upon. This is one reason explicit prejudice scores have declined over decades even as discrimination persists.

Implicit Measures

To get around self-presentation, researchers developed implicit measures, most famously the Implicit Association Test (IAT), which uses reaction times to gauge how readily people associate a group with positive or negative concepts. The IAT reveals that automatic associations often differ from consciously endorsed beliefs. Implicit bias is a genuine and important phenomenon, but the field has become more cautious about it: the test's reliability over time is modest, and the link between an individual's implicit score and any specific discriminatory act is weaker and less consistent than early enthusiasm suggested. Implicit measures are best understood as capturing real automatic associations, not as precise predictors of who will discriminate.

Behavioral and Field Measures

Because attitudes and behavior diverge, many researchers prefer to measure discrimination directly through field experiments—audit studies, matched-résumé designs, and observation of real-world outcomes. These reveal unequal treatment without relying on anyone's self-report, and they remain the strongest evidence that discrimination continues even where openly prejudiced attitudes have declined.

8. Effects on Targets

Being a target of prejudice and discrimination has measurable psychological and physical consequences. Chronic exposure to discrimination is associated with elevated stress, anxiety, depressive symptoms, and worse physical health outcomes, in part through the wear-and-tear of sustained stress responses. For sustained, identity-based harm, the concept of racial trauma captures how repeated experiences of discrimination can produce trauma-like effects.

Stereotype Threat

One well-documented effect is stereotype threat: when people are aware of a negative stereotype about a group they belong to, the fear of confirming it can impair their performance on relevant tasks. Worrying about being judged through the stereotype consumes cognitive resources, undermining the very performance the stereotype predicts. The effect helps explain how stereotypes can become self-fulfilling and how subtle situational cues affect outcomes.

Belonging and Mental Health

Stigma and exclusion undermine the basic human need to belong and can erode self-esteem and identity. Populations subject to persistent prejudice—such as LGBTQ communities—show elevated rates of certain mental health difficulties that researchers link not to anything intrinsic to the group but to the stress of stigma, discrimination, and minority status.

9. How to Reduce Prejudice

Decades of research point to several strategies that genuinely reduce prejudice—and to others that are popular but weakly supported.

Intergroup Contact

The single best-supported approach is intergroup contact, an idea Gordon Allport formalized as the "contact hypothesis." Simply putting groups in proximity is not enough; contact reduces prejudice most reliably when four conditions are met: equal status within the situation, common goals, cooperation rather than competition, and the support of authorities or norms. A large body of evidence, summarized in major meta-analyses, confirms that contact under these conditions reduces prejudice across many groups and settings, often by reducing anxiety and increasing empathy. Sherif's resolution of the Robbers Cave conflict through cooperative superordinate goals is a vivid demonstration of the principle in action.

Superordinate Goals and Recategorization

Encouraging people to see a larger shared identity—"we" rather than "us and them"—can dissolve in-group/out-group boundaries. The common in-group identity model shows that when former out-group members are recategorized as part of a single overarching group, bias toward them drops. Shared goals that no single group can achieve alone are a powerful tool for building that common identity.

Perspective-Taking and Empathy

Deliberately imagining the experience of an out-group member, and building empathy more broadly, reduces prejudice and increases willingness to help. Interventions that prompt perspective-taking, and even narrative experiences such as stories and well-designed media that humanize an out-group, can shift attitudes.

Counter-Stereotypical Exposure and Norm Change

Repeated exposure to individuals who clearly violate a stereotype weakens it over time. Equally important is changing social norms: people calibrate their behavior to what they believe is acceptable, so making anti-prejudice the visible norm—and prejudice socially costly—reliably shifts behavior. Because much discrimination is institutional, changing rules, policies, and structures is often more effective than trying to change individual hearts and minds one at a time.

What Works Less Well

Brief, one-shot diversity trainings and standalone implicit-bias workshops have a poor track record: any attitude change tends to be small and short-lived, and there is little evidence they reduce actual discrimination. Lasting change comes from sustained contact, structural reform, and consistent norms—not from a single session. Recognizing this connects the psychology of prejudice to the wider literature on social influence and how durable behavior change actually occurs.

10. Frequently Asked Questions

What is the difference between prejudice and discrimination?

Prejudice is an attitude—a usually negative prejudgment of people based on their group membership. Discrimination is behavior—the unequal or unfair treatment of people because of that membership. Prejudice happens in the mind; discrimination happens in action. A prejudiced person may not always discriminate, and discrimination can occur through policies and institutions even without conscious personal prejudice.

What causes prejudice?

Prejudice has several overlapping sources: the normal cognitive tendency to categorize people and form stereotypes, the human inclination to favor one's own group, competition over real or perceived resources, socialization and cultural learning, and motivational needs such as protecting self-esteem or reducing uncertainty. Most real-world prejudice reflects a combination of these factors rather than any single one.

What is implicit bias?

Implicit bias refers to automatic, often unconscious associations between social groups and evaluations or stereotypes that can influence judgment without a person's awareness or intent. It is measured with reaction-time tasks such as the Implicit Association Test. Implicit bias is real and widespread, though its measurement is debated and its link to specific discriminatory acts is weaker than once assumed.

Can prejudice be reduced?

Yes. The best-supported approach is intergroup contact—meaningful, cooperative interaction between groups under conditions of equal status and shared goals. Other evidence-based strategies include perspective-taking, exposure to counter-stereotypical examples, superordinate goals that unite groups, and changing the norms and institutional structures that sustain unequal treatment.

Are stereotypes always wrong?

Stereotypes are generalized beliefs about a group. Some contain a kernel of statistical truth, but they mislead because they are applied rigidly to individuals, ignore within-group variation, and resist disconfirming evidence. Even an accurate-on-average stereotype gives a poor prediction about any specific person, and many stereotypes are simply inaccurate.