Source: Textbook Ch. 4
Difficulty: Introductory | Prerequisites: Basic understanding of psychology research methods (Ch. 1–3 helpful).
Social cognition is the study of how people think about themselves and the social world: how they select, interpret, remember, and use information to make judgements and decisions. This chapter sits at the foundation of the entire course, because almost every later topic (attribution, attitudes, persuasion, stereotyping) relies on the cognitive machinery covered here. You need a basic grasp of schemas, heuristics, and framing effects before any of those chapters will click. If you have been away for a few weeks, start here.
People form impressions fast (within 100 ms) and rely heavily on mental shortcuts, prior knowledge, and the way information is framed. These shortcuts, called heuristics and schemas, are efficient but regularly lead to predictable errors such as confirmation bias, the planning fallacy, and misjudging probability. Understanding where your thinking takes shortcuts is the first step to thinking more carefully.
Schema
A knowledge structure: a coherent cluster of information organised and stored together in memory. Schemas guide attention, encoding, retrieval, and behaviour.
Think of it as a mental folder your brain opens whenever it encounters something familiar, filling in details before you even look closely.
Priming
The process by which exposure to a stimulus (a word, image, smell, or person) activates a schema and influences subsequent judgement or behaviour.
In simple terms, what you have just seen or thought about colours what you see or think about next.
Availability heuristic
A mental shortcut in which the frequency or probability of an event is judged by how easily examples come to mind.
In simple terms, if you can quickly think of several plane crashes, you will overestimate how often planes crash.
Representativeness heuristic
A mental shortcut in which the likelihood of something belonging to a category is judged by how similar it is to a typical member (prototype) of that category, sometimes ignoring base-rate information.
Think of it as judging a book by its cover: you assume the quiet, bookish person is a librarian, forgetting there are far more salespeople in the world.
Framing effect
The influence that the way information is presented (positive vs negative frame, gain vs loss) has on judgement and decision-making.
In simple terms, "90% survival rate" and "10% mortality rate" are the same fact, but people react very differently to each.
Confirmation bias
The tendency to search for, interpret, and remember evidence that supports an existing belief, while ignoring or discounting evidence that contradicts it.
Think of it as only reading reviews that agree with your opinion of a film you already liked.
Primacy effect
The tendency for information presented first to have a disproportionate influence on overall impressions.
In simple terms, first impressions really do stick.
Recency effect
The tendency for information presented last to sometimes carry extra weight, particularly when there is a delay between presentation and judgement.
Pluralistic ignorance
A situation in which most members of a group privately reject a norm but go along with it because they assume everyone else accepts it.
Think of it as nobody in the lecture asking a question because everyone assumes everyone else understands.
Self-fulfilling prophecy
A process by which a person's expectations about another person lead them to act in ways that cause the other person to confirm those expectations.
In simple terms, if a teacher expects a student to do well, the teacher may give that student more encouragement, and the student actually does do better (Pygmalion effect).
Planning fallacy
The tendency to underestimate the time, cost, or effort needed to complete a task, largely by ignoring past experience and external factors.
Think of it as always believing the essay will take two hours when it has never once taken fewer than five.
Fluency
The ease with which information is processed. More fluent processing leads to more favourable evaluations.
Construal
The way a person interprets or perceives a situation, which may differ from objective reality. Schemas heavily influence construal.
People form personality impressions from faces in as little as 100 ms, and these snap judgements agree with longer assessments
These rapid judgements predict actual behaviour poorly or not at all
Judgements of "competence" from faces predicted election outcomes 69% of the time
First-impression ratings predicted end-of-semester ratings at r = .7
Firsthand information
May be unrepresentative of the broader population (based on limited personal experience)
Subject to distortion to fit preconceptions or satisfy motives
May be distorted for impression management
Secondhand information
Vulnerable to ideological distortions (intentional or not, e.g. political campaigns)
Negative information attracts more attention and weighs more heavily in forming impressions
Media distortions: exaggeration for entertainment value
Violent crime is overrepresented in media; exposure to this correlates with feeling endangered
Order effects
Question order affects meaning (e.g. "Are you sad?" followed by "How many dates did you have?" primes a different response)
Primacy effect: information presented first has greater influence on impression formation
Recency effect: in some conditions, later information carries extra weight
Framing effects
The same information described differently produces different reactions: "terrorist" vs "freedom fighter," "inheritance tax" vs "death tax"
Negative framing elicits stronger responses because people are risk-averse
Losses feel subjectively more important than equivalent gains (prospect theory)
Temporal frames
Distant events are construed more abstractly, so essential features are emphasised
Near events are construed more concretely, so peripheral features are given more weight
Confirmation bias
Tendency to test an idea by searching for supporting evidence rather than disconfirming evidence
Motivated confirmation bias: even two-sided editorials cause people to become more convinced of their existing positions rather than moving to the middle
Pluralistic ignorance: people conform to misperceived group norms, creating false information about what the group truly believes (e.g. not asking questions in class, performed toughness in male groups)
Self-fulfilling prophecy: expectations change behaviour in ways that confirm those expectations
Pygmalion in the classroom: teachers' expectations shaped student performance
Belief in bank failure causes actual bank failure
Bottom-up vs top-down processing
Bottom-up: data-driven, driven by incoming information
Top-down: schema-driven, driven by existing knowledge structures
What schemas do
Guide attention: we attend chiefly to things we expect to see (e.g. missing the gorilla in the inattentional blindness study)
Affect encoding and retrieval: we remember schema-consistent information better
Affect construal: ambiguous descriptions interpreted differently depending on which schema is primed ("adventurous" vs "reckless")
Affect behaviour: elderly prime caused participants to walk more slowly afterwards
General concepts prime similar behaviour, but specific examples prime contrast (e.g. thinking about Einstein makes you rate yourself as less intelligent)
Schema activation
Activated by primes: words, symbols, significant others, smells
Similarity or feature matching: a schema can be activated even when the match is not identical
Misleading similarities: irrelevant features affect which schema is activated (e.g. "Is the Iraq war like Vietnam or like WWII?" leads to very different policy conclusions)
Two systems of thinking
Intuitive processes: fast, parallel, practised, largely unconscious
Rational processes: slower, rule-based, serial, requires cognitive capacity, often conscious
Quick intuitive judgements may feel accurate enough that people avoid the effort of rational analysis
Availability heuristic
Judge frequency or probability by ease of bringing examples to mind
Classic example: more words with 'r' in first position or third? (Third is correct, but first-position examples come to mind more easily.)
Affects self-perception: participants asked to list 6 examples of assertiveness rated themselves as more assertive than those asked to list 12 (listing 12 felt hard, so they inferred they were not very assertive)
Biases risk assessment and estimates of contribution in joint projects
Fluency
How easy it is to process information
More fluent processing leads to more favourable evaluation
Representativeness heuristic
Judge likelihood by how closely something matches a prototype
Often leads to ignoring base-rate information (e.g. assuming someone is a certain major based on personality rather than the actual distribution of majors)
Causes should resemble effects: people expect medicine for lung conditions to target the lungs
Perceiving patterns in genuinely random events (streaks are part and parcel of randomness)
Planning fallacy
People underestimate how long tasks will take
Driven by failure to account for external factors and past experience with similar tasks
Students often think snap judgements from faces are accurate predictors of behaviour. They are not. The judgements are consistent (people agree with each other) but they predict actual behaviour poorly.
Students confuse the availability heuristic with the representativeness heuristic. Availability is about ease of recall ("How quickly can I think of examples?"). Representativeness is about similarity to a prototype ("Does this person look like a typical engineer?").
Students assume confirmation bias only applies to stubborn or unintelligent people. In fact, it operates in everyone, including researchers, and even two-sided evidence can deepen existing positions.
Students often believe the planning fallacy is just optimism. It is more specifically a failure to account for external obstacles and a tendency to base predictions on best-case scenarios rather than past experience.
⚠️ Be able to distinguish availability heuristic from representativeness heuristic with an example for each.
⚠️ Know the difference between primacy and recency effects and when each one dominates.
⚠️ Understand framing effects and be able to explain why losses loom larger than gains (risk aversion / prospect theory logic).
⚠️ Know how schemas affect attention, memory, construal, and behaviour, with one example per effect.
⚠️ Pluralistic ignorance and self-fulfilling prophecy are commonly tested. Be able to give a real-world example of each.
⚠️ The planning fallacy is a frequent short-answer or multiple-choice item. Know that it stems from ignoring external factors, not just from optimism.
True or False: Snap judgements from faces predict actual behaviour accurately. (False)
The tendency to judge how common something is by how easily examples come to mind is the __________ heuristic. (availability)
True or False: Negative framing produces weaker responses than positive framing. (False, negative framing produces stronger responses)
When nobody in a group asks questions because everyone assumes the rest already understand, this is called __________. (pluralistic ignorance)
True or False: Activating the concept of "Einstein" through priming makes people feel smarter. (False, it primes contrast, making people feel less intelligent)
Q: A student reads a news article about a shark attack and then overestimates the probability of being bitten by a shark on holiday. Which heuristic is at work, and why?
A: The availability heuristic. The vivid news article makes the example highly accessible in memory, so the student judges shark attacks as more probable than they are.
Q: In a study, participants primed with words related to the elderly ("Florida," "wrinkle," "grey") walked more slowly down the hallway afterwards. What concept does this illustrate?
A: Schema activation and behavioural priming. The elderly-related words activated an "elderly" schema, which then influenced behaviour (walking speed) outside of conscious awareness.
Q: A politician describes a policy as saving 200 out of 600 lives. An opponent describes the same policy as letting 400 people die. Explain why public reactions might differ.
A: This is a framing effect. People are risk-averse, so the gain frame ("save 200 lives") feels more appealing, while the loss frame ("400 will die") feels more alarming, even though the outcomes are identical.
Q: Explain how motivated confirmation bias can cause two people who read the same balanced editorial to end up further apart in their views.
A: Each person selectively attends to and weighs the evidence supporting their existing position, while discounting the evidence for the opposing view. The result is that both become more entrenched rather than converging.
Q: A group of students at a party all drink heavily, each privately thinking it is too much but assuming the rest enjoy it. What phenomenon is this, and what maintains it?
A: Pluralistic ignorance. Each individual conforms to what they perceive as the group norm, which in turn reinforces the false norm for everyone else. It is maintained by the motive to conform and the absence of honest private communication.
Schemas and heuristics are the cognitive machinery behind attribution errors (Ch. 5): the fundamental attribution error is partly a schema-driven, top-down process. Framing effects reappear in persuasion (Ch. 8), where message framing determines whether the central or peripheral route is engaged. Confirmation bias and pluralistic ignorance are central to understanding how stereotypes persist (Ch. 11).
Social cognition, schemas, priming, heuristics, availability heuristic, representativeness heuristic, framing effect, confirmation bias, primacy effect, recency effect, order effects, pluralistic ignorance, self-fulfilling prophecy, Pygmalion effect, planning fallacy, construal, fluency, top-down processing, bottom-up processing, motivated reasoning, snap judgement, impression formation, cognitive shortcuts, mental shortcuts, risk aversion, prospect theory, schema activation, behavioural priming, temporal framing