Difficulty: Intermediate | Prerequisites: Chapter 1 (Introduction to Social Psychology)
This is the meatiest early chapter in the course. It covers how we process social information (fast vs slow thinking), the shortcuts and biases that distort our judgements, how we perceive and remember events, and how we explain other people's behaviour. Mastering this material is essential before you move on to attitudes, conformity or prejudice, because every later topic rests on the cognitive machinery described here. You should already be comfortable with the Chapter 1 distinction between correlational and experimental methods.
Our brains use two processing systems: a fast, intuitive one (System 1) and a slower, deliberate one (System 2). System 1 is efficient but prone to biases including overconfidence, confirmation bias and reliance on heuristics. We also construct our memories after the fact, and we systematically misattribute other people's behaviour to their personality rather than their situation (the fundamental attribution error). Our beliefs can even become self-fulfilling prophecies.
System 1 (automatic processing)
The intuitive, automatic, unconscious and fast mode of thinking. Also called implicit thinking. Think of it as: the mental autopilot that lets you read facial expressions or catch a ball without deliberation.
System 2 (controlled processing)
The deliberate, reflective, conscious and slower mode of thinking. Also called explicit thinking. In simple terms, this is the effortful thinking you use when solving a maths problem or weighing a big decision.
Priming
Activating a particular association in memory, which can then influence subsequent thoughts or actions without conscious awareness. Think of it as: hearing the word "doctor" makes you faster at recognising the word "nurse."
Embodied cognition
The mutual influence of bodily sensations on cognitive preferences and social judgements. In simple terms, what your body feels (warmth, heaviness, smoothness) can colour what your mind thinks about a person or situation.
Overconfidence phenomenon
The tendency to be more confident than correct, overestimating the accuracy of one's beliefs. Think of it as: being 90% sure of an answer that turns out to be wrong 40% of the time.
Confirmation bias
The tendency to search for information that confirms one's existing beliefs while ignoring or discounting evidence that contradicts them. In simple terms, we look for proof we are right and avoid proof we are wrong.
Heuristic
A mental shortcut that enables quick, efficient judgements, sometimes at the cost of accuracy. Think of it as: a rule of thumb your brain uses to save time.
Representativeness heuristic
The tendency to judge the likelihood that something belongs to a category based on how much it resembles a typical member of that category, sometimes ignoring base rates. In simple terms, if someone looks like a librarian, you assume they are one, even if librarians are rare.
Availability heuristic
Judging the likelihood of events based on how easily examples come to mind. Think of it as: shark attacks feel common because they are memorable, not because they are frequent.
Counterfactual thinking
Imagining alternative scenarios and outcomes that might have happened but did not. In simple terms, the "what if" and "if only" thoughts that follow a near miss or a surprising result.
Illusory correlation
Perceiving a relationship between two things where none exists, or perceiving a stronger relationship than actually exists. Think of it as: believing your lucky socks help you win because you remember the wins and forget the losses.
Belief perseverance
The persistence of one's initial conceptions even after the basis for those conceptions has been discredited. In simple terms, once you believe something, disproving it is surprisingly hard.
Misinformation effect
Incorporating misleading information into one's memory of an event after the fact. Think of it as: a leading question after a car crash changing what you "remember" seeing.
Fundamental attribution error (FAE)
The tendency to overestimate the role of personal dispositions and underestimate the role of situational factors when explaining other people's behaviour. In simple terms, we blame the person when the situation may be the real cause.
Spontaneous trait inference
An effortless, automatic inference of a personality trait after exposure to someone's behaviour. Think of it as: seeing someone help an elderly person and instantly labelling them "kind."
Self-fulfilling prophecy
A belief that leads to its own fulfilment because acting on the belief produces the expected outcome. In simple terms, expecting someone to be unfriendly can make you act coldly, which makes them unfriendly in return.
Behavioural confirmation
A type of self-fulfilling prophecy in which people's social expectations cause them to behave in ways that elicit the expected behaviour from others. Think of it as: the mechanism behind self-fulfilling prophecies in everyday interaction.
System 1 is fast, automatic, intuitive. It handles pattern recognition, first impressions and gut feelings. It runs most of our daily social processing.
System 2 is slow, deliberate, conscious. It handles careful reasoning and complex decisions.
System 1 influences more of our actions than we tend to realise. Automatic thinking draws on schemas, emotional reactions, expertise and snap judgements.
Priming activates a particular association in memory, which can then steer thoughts, interpretations and even behaviour.
Stimuli we do not consciously notice can subtly shape how we interpret and recall events.
Embodied cognition extends this: bodily sensations (holding a warm cup, sitting in a hard chair) influence cognitive preferences and social judgements.
Automatic thinking can seem to "make us smart," but the unconscious mind has a capacity for illusion: perceptual misinterpretations, fantasies and constructed beliefs.
Not all beliefs are false, but knowing how false beliefs form helps you spot them.
The overconfidence phenomenon is the tendency to overestimate the accuracy of one's beliefs.
Incompetence feeds overconfidence: people who perform worst on a task are often the most confident they did well, particularly on tasks that seem easy.
Overconfidence persists partly because we admire confidence in others.
Remedies: obtain prompt feedback; deliberately think of at least one reason your judgement might be wrong; remain wary of dogmatic statements from others.
We eagerly verify our beliefs but rarely seek disconfirming evidence.
People choose news sources and friends that align with their views, creating "ideological echo chambers."
Confirmation bias appears to operate as a System 1 snap judgement.
The stability of our self-images may be partly explained by confirmation bias.
Representativeness heuristic: judging category membership by resemblance to a prototype, sometimes ignoring base rates.
Availability heuristic: judging frequency or probability by how easily examples come to mind. Vivid, recent or emotionally charged events feel more common than they are.
Imagining worse alternatives helps us feel better about what happened.
Imagining better alternatives helps us prepare for next time.
Counterfactual thinking is most intense when the event was both significant and unlikely.
Illusory correlation is perceiving a relationship where none exists (or a stronger one than actually exists).
People easily misperceive random events as confirming their beliefs. Gamblers attribute wins to skill and losses to bad luck.
Regression toward the mean: extreme scores or behaviours tend to move back toward the average. This is a statistical inevitability, not a causal force.
Happy moods make the world seem friendlier, decisions easier and good memories more accessible.
Sad moods prompt more focused, analytical thinking but also prime negative memories.
Mood infuses judgement in both directions.
Our preconceptions guide how we perceive information. We respond to reality as we construe it, not as it objectively is.
First impressions are more often right than wrong, but prejudgements do err.
Political (and sports-fan) perceptions illustrate how the same event looks different depending on where you stand.
Once accepted, a belief is surprisingly resistant to discrediting. In classic studies, about 75% of a false belief survived even after participants were told the original evidence was fabricated.
The more we explain to ourselves how a belief might be true, the more closed we become to challenges.
We construct memories at the time of retrieval, not at the time of the event. We unconsciously revise memories to fit our current knowledge.
The misinformation effect: misleading post-event information becomes woven into our memory of the event.
People whose attitudes have changed often insist they always felt the way they feel now ("rosy retrospection").
We under-report bad behaviour and over-report good behaviour.
We infer that others' actions reflect their dispositions or traits. This happens automatically (spontaneous trait inference).
The fundamental attribution error (FAE): we overweight personal factors and underweight situational factors when explaining other people's behaviour.
Causes of the FAE: we observe others from a different perspective than we observe ourselves; we find causes where we look for them.
Culture matters: individualist (Western) cultures are more prone to dispositional attributions than collectivist cultures.
Our beliefs and expectations influence how we act, and acting on them can generate their own confirmation.
Self-fulfilling prophecy: a belief leads to behaviour that makes the belief come true. Example: a teacher who expects a student to succeed treats that student more positively, boosting performance.
Behavioural confirmation is the interpersonal mechanism behind self-fulfilling prophecies.
Understanding these biases is not merely academic. Overconfidence and confirmation bias influence jury decisions, medical diagnoses and financial forecasts. The fundamental attribution error shapes how we judge co-workers, defendants and public figures. Awareness of these tendencies is the first step toward correcting for them.
Students often think System 1 is "bad" and System 2 is "good." Both systems are useful. System 1 handles the vast majority of daily processing efficiently; the problem arises only when it is applied to tasks that require careful reasoning.
Students confuse the availability heuristic with the representativeness heuristic. Availability is about ease of recall (how quickly examples come to mind). Representativeness is about resemblance (how much something looks like a category prototype).
Students assume the fundamental attribution error means we should never attribute behaviour to personality. That is too strong. The error is one of degree: we over-weight disposition and under-weight situation, but dispositions do matter.
Students sometimes think belief perseverance means people are stupid. It is a normal cognitive process. Asking people to consider the opposite is one of the most effective remedies.
Students confuse illusory correlation with confirmation bias. Illusory correlation is about perceiving a pattern in data that does not exist. Confirmation bias is about selectively seeking information that supports an existing belief.
⚠️ System 1 vs System 2 is a framework that recurs throughout the course. Be ready to classify examples of thinking as automatic or controlled.
⚠️ The fundamental attribution error is often called "social psychology's most important lesson." Expect essay, short-answer and scenario questions.
⚠️ Know the difference between the representativeness heuristic and the availability heuristic. A common exam format gives you a scenario and asks which heuristic is at work.
⚠️ Confirmation bias and belief perseverance are frequently tested together. Know how they differ and how they reinforce each other.
⚠️ Self-fulfilling prophecy questions often use the teacher-expectation research (Rosenthal and Jacobson) as the example. Be ready to describe the mechanism step by step.
True or false: System 2 is responsible for the majority of our day-to-day social processing. (False, System 1 handles most of it.)
Fill in the blank: ________ is the activation of a particular association in memory that can influence later thoughts. (Priming.)
True or false: The availability heuristic judges likelihood by how much something resembles a typical example. (False, that is the representativeness heuristic. Availability judges likelihood by ease of recall.)
Fill in the blank: The tendency to overattribute others' behaviour to their personality rather than their situation is called the ________. (Fundamental attribution error.)
True or false: Once the evidence for a belief is discredited, people readily abandon that belief. (False, belief perseverance means the belief often survives.)
Q: Explain the difference between System 1 and System 2 processing, and give one example of each in a social context.
A: System 1 is fast, automatic and intuitive (e.g. forming a first impression of someone you just met). System 2 is slow, deliberate and conscious (e.g. carefully evaluating whether that first impression is fair given what you know about the situation).
Q: A student reads a vivid news article about a plane crash and then overestimates the probability of dying in a plane accident. Which heuristic is at work, and why?
A: The availability heuristic. The vivid story makes plane crashes easy to recall, which inflates the perceived probability.
Q: Describe the fundamental attribution error and explain one reason it occurs.
A: The FAE is the tendency to overattribute others' behaviour to their personality and underattribute it to their situation. One reason it occurs is perspective: we observe others from the outside, so the person is salient and the situation fades into the background.
Q: How does a self-fulfilling prophecy work? Use the teacher-expectation example.
A: A teacher is told (falsely) that certain students are about to bloom intellectually. The teacher then treats those students more warmly, gives them more feedback, and challenges them more. The students respond by actually improving, which confirms the teacher's original (false) expectation.
Q: What is the difference between confirmation bias and belief perseverance?
A: Confirmation bias is the tendency to seek information that supports what you already believe. Belief perseverance is the tendency to maintain a belief even after the evidence for it has been discredited. They often work together: confirmation bias prevents you from encountering disconfirming evidence, and belief perseverance keeps the belief alive even when you do.
The dual-process framework (System 1 vs System 2) reappears in the conformity chapter (Chapter 6), where automatic mimicry and the chameleon effect are System 1 phenomena. Confirmation bias and belief perseverance connect to the study of attitudes and persuasion (Chapter 4). The fundamental attribution error is central to understanding prejudice and stereotyping in later chapters.
System 1, System 2, automatic processing, controlled processing, dual-process theory, Kahneman, priming, embodied cognition, overconfidence, Dunning-Kruger effect, confirmation bias, echo chamber, heuristic, representativeness heuristic, availability heuristic, counterfactual thinking, illusory correlation, regression to the mean, belief perseverance, misinformation effect, rosy retrospection, memory construction, attribution theory, fundamental attribution error, FAE, correspondence bias, spontaneous trait inference, self-fulfilling prophecy, Pygmalion effect, behavioural confirmation, camera perspective bias