Difficulty: Intermediate | Prerequisites: Parts 1–2 (Intro, Research Methods, The Self, Motivations, Social Judgments).
This section covers the social machinery that shapes what people believe and how they behave in groups. Attitudes are evaluations (favourable or unfavourable) that influence action. Social norms are the unwritten rules that govern group behaviour. Conformity is the process by which individuals adjust their behaviour to align with those norms. Together, these three topics explain a huge range of everyday social behaviour, from brand loyalty to peer pressure to obedience to authority. You should already be comfortable with cognitive dissonance, self-presentation and the dual-process model before working through this material.
Attitudes have three components (affect, behaviour, cognition) and can be measured implicitly or explicitly. They do not always predict behaviour well, but they predict it better when they are strong, experience-based and free from competing influences. Social norms (descriptive and injunctive) set group expectations, and conformity occurs through informational influence (looking to others for answers) or normative influence (wanting to fit in). Classic studies by Sherif, Asch, Milgram and Zimbardo illustrate these forces.
Attitude
An evaluative reaction (favourable or unfavourable) toward something, composed of affect (feelings), behaviour (actions/intentions) and cognition (thoughts/beliefs).
Implicit Attitude
An automatic, often unconscious evaluation. Measured indirectly through tools like the IAT, reaction times or physiological responses.
Explicit Attitude
A consciously held evaluation. Measured through self-report surveys or direct observation.
Affective Primacy Thesis
The idea that we evaluate objects emotionally before we consciously process them. Feelings come first.
Mere Exposure Effect
Repeated exposure to a stimulus increases liking for it, even without conscious awareness.
Cognitive Dissonance (in Attitudes)
When behaviour and attitudes conflict, people often shift the attitude to match the behaviour. This links back to the Motivations unit.
Self-Perception Theory
When attitudes are weak or ambiguous, we infer them by observing our own behaviour. "I keep going to the gym, so I must enjoy exercise."
Overjustification Effect
Providing an external reward for something you already enjoy can undermine your intrinsic motivation for it.
Ambivalence
Holding mixed or contradictory feelings about the same object. Ambivalent attitudes are less stable and less predictive of behaviour.
Affect – your emotional reaction ("I feel good about recycling")
Behaviour – your actions or intentions ("I recycle every week")
Cognition – your beliefs ("recycling reduces landfill waste")
Attitudes vary in valence (positive or negative) and strength (how strongly held).
Object appraisal – quickly deciding whether to approach or avoid something
Social adaption – choosing who to affiliate with based on shared attitudes
Value expression – communicating your core values or defending against internal conflict
Implicit measures – the IAT (Implicit Association Test) measures reaction times to pairings of concepts; physiological measures (fMRI, skin conductance); language analysis; body movement
Explicit measures – self-report questionnaires and direct observation
The affective primacy thesis says emotional evaluation happens before conscious processing. The irregular polygon study demonstrated this: participants recognised shapes at chance level but preferred the ones they had been exposed to.
The mere exposure effect means simply seeing something repeatedly increases liking.
Often poorly. Attitudes predict behaviour better when they are:
Strong and clearly held
Shaped by direct personal experience
Free from competing social pressures
The causal arrow also runs the other way:
Self-presentation – you adopt attitudes that match your public behaviour ("I said smoking is cool, so maybe it is")
Cognitive dissonance – behaviour-attitude conflict creates discomfort, so you shift the attitude
Insufficient justification – the less external reason you have for a behaviour, the more you internalise it as an attitude (the $1 vs. $20 experiment)
Self-justification – after choosing between equally attractive options, you come to see the chosen option as better and the rejected one as worse
Overjustification – adding an external reward to an intrinsically motivated activity can erode the intrinsic motivation
Self-perception – when attitudes are unclear, you infer them from your actions
Roleplay – taking on a role leads you to seek arguments supporting that role, which shifts your attitudes
Ambivalence makes attitudes less stable and less predictive.
Attitude stability changes with motivation: when you care about an issue, your attitude firms up.
Age and attitude change follow a U-shape: young people and older adults show more attitude change than middle-aged adults.
Descriptive Norms
What people actually do. The observed behaviour of group members. "Most guests reuse their towels."
Injunctive Norms
What people believe others should do. The perceived expectation, even without direct observation. "You ought to reuse your towel."
Black Sheep Effect
Ingroup members who violate norms are judged more harshly than outgroup members who do the same thing, because their behaviour reflects on the group.
Breaking norms creates internal dissonance and risks ostracism.
Following norms brings social approval and acceptance.
Descriptive – what most people do ("75% of guests reuse towels")
Injunctive – what people should do ("please reuse your towel to help the environment")
Normative messages are most effective when they combine both: "most people do X, and you should too." The hotel towel-reuse experiment is the classic demonstration.
We favour ingroup members in general, but we punish ingroup norm-violators more harshly than outgroup norm-violators. Their behaviour threatens the group's identity and reputation.
Conformity
Changing your behaviour due to the real or imagined influence of others.
Acceptance
Conforming because you genuinely believe the group is right. Also called private conformity or internalisation.
Compliance
Conforming outwardly without actually changing your private beliefs.
Obedience
A subset of compliance: conforming specifically because an authority figure gave a direct command.
Informational Influence
Looking to others for guidance when the situation is ambiguous. You assume they know something you do not.
Normative Influence
Conforming to be accepted or to avoid rejection, even when you know the group is wrong.
Chameleon Effect
Unconsciously mimicking the postures, mannerisms and behaviours of people around you.
Psychological Reactance
The motivational arousal that occurs when you feel your freedom is being threatened. It can produce a boomerang effect where you do the opposite of what you are told.
Sherif (autokinetic effect) – when the stimulus is ambiguous, people converge on a group average. This is informational influence: "I do not know the answer, so I will go with what others say."
Asch (line-length study) – when the stimulus is unambiguous and confederates give an obviously wrong answer, about a third of participants conform anyway. This is normative influence: the desire for acceptance overrides what you can see with your own eyes.
Milgram (obedience study) – participants administered what they believed were painful electric shocks to another person simply because an authority figure told them to. Demonstrates the power of obedience.
Zimbardo (Stanford Prison Experiment) – assigning people to "guard" and "prisoner" roles led to abusive behaviour. Illustrates how situational power and authority can override individual disposition.
Informational – the situation is ambiguous, so you look to others for the correct answer. Leads to genuine acceptance.
Normative – the situation may be clear, but you conform out of fear of rejection or desire for approval. Often produces compliance without acceptance.
Group size – conformity increases with group size up to about 3–5 members, then shows diminishing returns.
Group cohesion – the closer-knit the group, the stronger the pressure to conform.
Unanimity – if even one other person disagrees with the group, conformity drops sharply.
Public vs. private response – people conform more when their answer is public.
Prior commitment – if you have already stated a position, you are less likely to conform.
Relative status – high-status individuals are less likely to conform and have more influence on others.
We unconsciously mimic the body language, speech patterns and facial expressions of those around us. This mimicry serves as social glue: it builds rapport and signals connection.
Psychological reactance – when a behaviour feels forced, it triggers a motivational state to restore freedom.
Boomerang effect – heavy-handed pressure can backfire, pushing people toward the opposite behaviour.
Once something becomes a "should," people feel their autonomy is compromised and may resist simply to assert independence.
Students often think conformity is always a bad thing. Informational conformity is often rational and adaptive: when you do not know the answer, looking to others is sensible.
Students sometimes confuse compliance with acceptance. Compliance is surface-level conformity (you go along publicly); acceptance is genuine belief change.
Students frequently assume attitudes always drive behaviour. The research shows the relationship is weaker than intuition suggests, and behaviour often drives attitudes instead.
Students tend to think the mere exposure effect requires conscious awareness. It does not. Subliminal exposure is enough to increase liking.
⚠️ Know the four classic conformity studies (Sherif, Asch, Milgram, Zimbardo) and which type of influence each demonstrates.
⚠️ Be able to distinguish descriptive norms from injunctive norms and explain why combining them is more effective.
⚠️ Understand the conditions under which attitudes predict behaviour (strong, experience-based, low competing pressure).
⚠️ Be prepared for questions on how behaviour changes attitudes (cognitive dissonance, self-perception, insufficient justification, overjustification).
⚠️ Know the predictors of conformity and be able to explain how each one increases or decreases conformity pressure.
True or False: Implicit attitudes are measured through self-report questionnaires. (False. Implicit attitudes are measured indirectly, e.g. the IAT.)
Name the three components of an attitude. (Affect, behaviour, cognition.)
True or False: In Asch's line study, conformity was driven by informational influence. (False. It was normative influence; the correct answer was obvious.)
Fill in the blank: ___ norms describe what people actually do; ___ norms describe what people should do. (Descriptive; injunctive.)
True or False: Conformity increases steadily as group size grows from 3 to 20. (False. It increases up to about 3–5 members, then shows diminishing returns.)
Q: A hotel places a sign saying "75% of guests reuse their towels. Please join them in helping the environment." What types of norms does this message combine, and why is it effective?
A: It combines a descriptive norm (75% of guests do it) with an injunctive norm (you should do it too). Research shows that combining both is more persuasive than using either alone, because people receive both social proof and a moral nudge.
Q: In Milgram's obedience study, what factor best explains why participants continued administering shocks?
A: Obedience to authority. The experimenter (an authority figure in a lab coat) issued direct commands, and most participants complied despite personal discomfort. This demonstrates the power of situational authority over individual disposition.
Q: Explain the overjustification effect with an example.
A: When you add an external reward to an activity someone already finds intrinsically enjoyable, the reward can undermine the intrinsic motivation. For example, a child who loves drawing may draw less if paid for each drawing, because the external reward replaces the internal motivation.
Q: What is the difference between informational influence and normative influence? Give one study example for each.
A: Informational influence occurs when the situation is ambiguous and you look to others for the correct answer (Sherif's autokinetic study). Normative influence occurs when you conform to avoid rejection or gain acceptance, even when you know the group is wrong (Asch's line study).
Q: A person joins a fraternity that required a gruelling initiation. They now value the fraternity highly, even though the meetings are quite dull. What concept explains this?
A: Effort justification. The more effort you invest to gain access to something, the more you value it, because devaluing it would create cognitive dissonance with the effort you spent.
Cognitive dissonance and self-perception theory both appear in the Motivations unit (Part 2) and resurface here in Attitudes. The conformity studies (Asch, Milgram) connect directly to the Persuasion unit (Part 4), where techniques like foot-in-the-door exploit the same compliance dynamics. Normative and informational influence reappear in group dynamics and help explain why persuasion backfires (psychological reactance). The attitude-behaviour gap links to the Self unit's coverage of self-presentation: people may express attitudes they do not privately hold.
Attitude, affect, behaviour, cognition, ABC model of attitudes, implicit attitude, explicit attitude, IAT, Implicit Association Test, valence, attitude strength, object appraisal, social adaption, value expression, affective primacy, mere exposure effect, attitude-behaviour gap, self-perception theory, Bem, overjustification effect, cognitive dissonance, insufficient justification, self-justification, ambivalence, attitude stability, descriptive norms, injunctive norms, normative message, hotel towel experiment, black sheep effect, ingroup punishment, conformity, acceptance, compliance, obedience, Sherif autokinetic effect, Asch line study, Milgram obedience, Zimbardo Stanford Prison Experiment, informational influence, normative influence, chameleon effect, mimicry, group size, group cohesion, unanimity, public vs private response, prior commitment, status, psychological reactance, boomerang effect