Difficulty: Introductory | Prerequisites: None. This is foundational material for the course.
Social psychology sits between sociology and personality psychology, studying how the presence of other people (real or imagined) shapes what we think, feel and do. Chapters 1 and 2 lay the groundwork: Chapter 1 introduces the field's core ideas, including the power of the situation, the fundamental attribution error and the role of construal. Chapter 2 covers the research methods social psychologists rely on, from observational studies to experiments, and the concepts you need to evaluate any study you encounter in this course. If you have been away for a few weeks, start here.
Social psychology studies how people are influenced by the real or imagined presence of others, with the situation often mattering far more than personality. We tend to overattribute behaviour to personality traits (the fundamental attribution error) and underestimate situational forces. Understanding the field also means knowing how to tell a correlational finding from a causal one and what makes a study internally or externally valid.
Social psychology
The scientific study of the way in which people's thoughts, feelings and behaviours are influenced by the real or imagined presence of other people. In simple terms, it is the study of how other people change what we think, feel and do.
Social influence
The effect that the words, actions or mere presence of other people have on our thoughts, feelings, attitudes or behaviour. Think of it as the invisible pressure other people exert on you, whether or not they intend to.
Fundamental attribution error (FAE)
The tendency to overestimate the role of internal, dispositional factors and to underestimate the role of situational factors when explaining other people's behaviour. In simple terms, we blame personality when the situation is often the real driver.
Construal
A person's interpretation or perception of their social environment. Behaviour depends on how we see a situation, not on its objective features.
Self-fulfilling prophecy
The process by which our expectations about another person lead that person to behave in ways that confirm those expectations.
Correlation
A statistical technique for measuring how strongly two variables are related and how well one can be predicted from the other. Correlation tells you two things move together; it does not tell you one causes the other.
Causation
A relationship in which one event is the direct result of another event occurring.
Independent variable (IV)
The variable a researcher deliberately changes or manipulates to see whether it affects some other variable. Think of it as the thing the experimenter controls.
Dependent variable (DV)
The variable a researcher measures to see whether it is influenced by the independent variable. Think of it as the outcome you are watching.
Confounding variable
An outside influence that changes the apparent relationship between the independent and dependent variables, muddying your ability to draw causal conclusions.
Control variable
An element in an experiment that is kept constant throughout the investigation so it does not interfere with the results.
Random assignment to condition
A process ensuring that every participant has an equal chance of being placed in any condition of the experiment, so personality and background differences are distributed evenly across groups.
Internal validity
The degree to which an experiment ensures that nothing besides the independent variable can affect the dependent variable. High internal validity means you can be confident the IV caused the change in the DV.
External validity
The extent to which a study's results can be generalised to other situations and other people. In simple terms, would the finding hold outside the lab?
Interjudge reliability (inter-rater reliability)
The level of agreement between two or more independent observers coding the same data. When multiple judges reach the same conclusion, the observations are less likely to reflect one person's subjective impressions.
Social psychology examines the individual in the context of a social situation. Its goal is to identify properties of human nature that make almost everyone susceptible to social influence, regardless of social class or culture.
SP studies adults, universal principles, "normal" mundane behaviour and the power of the situation.
SP sits between sociology (which looks at groups and institutions) and personality psychology (which looks at individual differences). Social psychologists emphasise the psychological processes shared by most people that make them responsive to social influence.
1. The power of social situations
Underestimating the power of social influence creates a false sense of security.
It increases personal vulnerability to destructive social influence.
It lulls us into lowering our guard.
Failing to appreciate situational power leads us to oversimplify complex situations and misunderstand true causes.
2. The power of social interpretation (construal)
Social psychology focuses on people's subjective understanding of a situation.
Behaviour is determined by how we perceive a situation, not by its objective conditions.
3. The need to feel good about ourselves
People have a strong need to maintain positive self-regard.
This need can lead people to distort the world rather than represent it accurately.
4. The need to be accurate
We try to gain accurate understanding so we can make effective judgements and decisions.
We often act on the basis of incomplete or inaccurately interpreted information.
5. Our expectations can change the social world
Self-fulfilling prophecy: our beliefs about a person can cause them to act in ways that confirm those beliefs.
Key study: Rosenthal's classroom study, where teachers' expectations about students' ability influenced actual student performance.
The tendency to explain behaviour in terms of personality traits and to underestimate situational forces. Aspects of the social situation that seem minor can overwhelm personality differences.
People's behaviour also depends on their construal of their social environment. Two competing motives shape how we process social information: the need to feel good about ourselves (self-esteem) and the need to be accurate (social cognition).
Community Game vs. Wall Street Game: The same game was labelled differently for two groups. The label alone changed cooperative behaviour dramatically, demonstrating the power of construal.
Rosenthal's classroom study (self-fulfilling prophecy): Teachers told certain students were "late bloomers" treated those students differently, and the students' performance rose to match the expectation.
Observational research
Researchers observe behaviour as it naturally occurs.
Limitation: you can describe what happens but cannot explain why.
Correlational research
Two or more variables are systematically measured and their relationship is assessed (how much one can be predicted from the other).
Limitation: correlation does not equal causation. It tells you two variables are related, nothing more.
Experimental research
The researcher manipulates an independent variable and measures the effect on a dependent variable while controlling extraneous factors.
Limitation: experimental settings can be artificial and distant from real life.
Correlation means two variables move together; causation means one event directly produces the other. This distinction is one of the most commonly tested concepts in introductory methods. When you see a correlational finding, always ask: could a third variable explain the link?
Independent variable (IV): What the researcher manipulates.
Dependent variable (DV): What the researcher measures.
Confounding variable: An uncontrolled outside factor that distorts the IV-DV relationship.
Control variable: A factor held constant throughout the experiment.
Random assignment: Every participant has an equal chance of being placed in any condition. This distributes individual differences evenly across groups and is the key tool for ruling out confounds.
Internal validity: Confidence that only the IV influenced the DV. Achieved through controlling extraneous variables and random assignment.
External validity: Confidence that the results generalise to other settings and populations.
Interjudge reliability: Agreement between independent observers coding the same data; guards against subjective bias.
Correlational: Cannot establish causation.
Experimental: Settings may be artificial; results may not generalise.
Observational/survey: Cannot determine why behaviour occurs; limited to description.
Students often think social psychology is the same as sociology. It is not. SP focuses on the individual in a social context; sociology focuses on groups, institutions and social structures.
Students frequently assume that a strong correlation means one variable causes the other. Correlation only tells you two things move together; a third variable may be driving both.
Many students believe the fundamental attribution error means we always get attributions wrong. The error is a tendency, not an absolute. We are especially prone to it for negative or unexpected outcomes, and it is moderated by culture.
Students sometimes confuse internal validity with external validity. Internal validity is about whether the experiment was clean (only the IV affected the DV). External validity is about whether the findings transfer to other people and settings.
⚠️ Be prepared to define social psychology and distinguish it from sociology and personality psychology.
⚠️ The fundamental attribution error is a recurring concept across multiple chapters. Know the definition cold and be ready to apply it to a scenario.
⚠️ Know the difference between correlation and causation. Expect a question asking you to identify whether a study shows correlation or causation.
⚠️ Be able to identify the IV, DV, confounding variables and control variables in a described study.
⚠️ Understand why random assignment matters for internal validity.
⚠️ The Community Game vs. Wall Street Game study and Rosenthal's classroom study are likely exam material. Know what each demonstrates.
True or false: Social psychology primarily studies group-level phenomena like institutions and social class. (False, that is sociology. SP studies the individual in a social context.)
Fill in the blank: The tendency to overestimate dispositional factors and underestimate situational factors is called the __________. (Fundamental attribution error.)
True or false: A strong correlation between two variables means one causes the other. (False. Correlation does not equal causation.)
Fill in the blank: __________ is the process by which our expectations about a person cause that person to behave in ways that confirm those expectations. (Self-fulfilling prophecy.)
True or false: Random assignment ensures that each participant has an equal chance of being in any experimental condition. (True.)
Q: Define social psychology and explain how it differs from sociology and personality psychology.
A: Social psychology is the scientific study of how people's thoughts, feelings and behaviours are influenced by the real or imagined presence of others. Unlike sociology, which analyses groups and institutions, SP focuses on the individual. Unlike personality psychology, which studies individual differences, SP looks for universal processes that make people susceptible to social influence.
Q: In the Community Game vs. Wall Street Game study, participants played the same game under different labels. What did this demonstrate?
A: It demonstrated the power of construal. Simply changing the name of the game changed participants' cooperative behaviour, showing that subjective interpretation of a situation matters more than its objective features.
Q: A researcher finds that students who eat breakfast get higher exam scores. Can the researcher conclude that eating breakfast causes higher scores? Why or why not?
A: No. This is a correlational finding. A third variable (such as general health habits, socioeconomic background or sleep quality) could explain both breakfast-eating and exam performance. Causation can only be established through an experiment with random assignment.
Q: What is internal validity, and what are the two main ways researchers achieve it?
A: Internal validity is the confidence that only the independent variable influenced the dependent variable. Researchers achieve it by controlling all extraneous variables and by randomly assigning participants to conditions.
Q: Explain the fundamental attribution error using an example.
A: The FAE is the tendency to attribute others' behaviour to personality traits while underestimating situational forces. For example, if a colleague is short-tempered in a meeting, you might conclude they are a rude person (dispositional attribution) rather than considering they may be under deadline pressure or unwell (situational factors).
The fundamental attribution error introduced here reappears in Chapter 4 (Social Perception) alongside the actor-observer difference, self-serving attributions and the just-world belief. Understanding construal in Chapter 1 sets the stage for schemas and heuristics in Chapter 3 (Social Cognition), which are the specific mental tools people use to interpret their social world. Research methods from Chapter 2 underpin every study you will encounter for the rest of the course, so the ability to identify IVs, DVs and validity issues is not chapter-specific but cumulative.
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