sources:

• text: Standard textbook reference

IB Psychology is the systematic scientific study of behaviour and mental processes. The course examines how biological, cognitive, and sociocultural factors influence human behaviour, and develops students’ understanding of research methodology and ethics. Psychology sits at the intersection of natural sciences (through its biological basis), social sciences (through its study of social influences), and humanities (through its exploration of the mind and consciousness).

The IB Psychology course is divided into a core component and an elective component. The core covers three levels of analysis — biological, cognitive, and sociocultural — alongside research methodology. The elective allows specialisation in either abnormal psychology or health psychology. The course culminates in internal and external assessments that test your ability to evaluate research, apply theory, and think critically about human behaviour.

• Abnormal Psychology
• Biological Level Of Analysis
• Cognitive Level Of Analysis
• Developmental Psychology
• Flashcards Abnormal
• Flashcards Biological
• Flashcards Cognitive
• Flashcards Developmental
• Flashcards Qualitative
• Flashcards Research Methods
• Flashcards Sociocultural
• Practice Abnormal
• Practice Biological
• Practice Cognitive
• Practice Sociocultural
• Psychology
• Qualitative Research
• Research Methods
• Sociocultural Level Of Analysis

The IB Psychology course is assessed through three components:

Paper 1 (2 hours, 44 marks, 50%): Covers the three core areas — biological, cognitive, and sociocultural levels of analysis — plus research methodology. You will answer one compulsory question and one essay question from a choice of three. The essay questions require you to discuss research relevant to a specific approach or issue.

Paper 2 (2 hours, 44 marks, 50%): Covers the elective section (abnormal psychology or health psychology). You will answer one compulsory question and one essay question from a choice of three.

The IA is a psychological investigation that you design and conduct yourself. You choose a research question, review relevant literature, design a study, collect and analyse data, and write a report of 2000 words. This component tests your understanding of research methods and your ability to apply them independently.

IB Psychology uses specific command terms that indicate the depth of response required:

• Outline: Give a brief account or summary
• Discuss: Give a balanced argument including for and against
• Explain: Give a detailed account including reasons or causes
• Evaluate: Make a judgement by weighing up evidence and arguments
• Compare: Identify similarities and differences
• Contrast: Focus on the differences between two or more things

The science of why we do what we do: Psychology seeks to understand the causes of behaviour at multiple levels. Why do people conform to group norms? How does stress affect immune function? What happens in the brain when we form memories? These questions connect biology, cognition, and social context.

Why it matters: Psychological literacy helps you understand your own thinking patterns, recognise biases in decision-making, appreciate the complexity of mental health conditions, and navigate social interactions more effectively. In the IB context, psychology develops critical thinking skills that transfer to every other subject.

The key insight: Behaviour is overdetermined — it is almost always the product of multiple interacting factors across different levels of analysis. A single explanation is rarely sufficient. The biological level might explain the mechanism, the cognitive level the process, and the sociocultural level the context. Strong psychological analysis integrates all three.

The biological level of analysis examines how physiological mechanisms, brain structures, neurochemistry, and genetics influence behaviour. This approach assumes that behaviour has a biological basis and can be understood through the study of the nervous system, the endocrine system, and genetic inheritance.

Neurotransmitters: Chemical messengers that transmit signals across synapses. Key neurotransmitters include:

• Serotonin — Regulates mood, sleep, appetite. Low levels linked to depression.
• Dopamine — Involved in reward, motivation, and motor control. Abnormalities linked to schizophrenia and Parkinson’s disease.
• Noradrenaline (norepinephrine) — Activates the fight-or-flight response. Involved in arousal and attention.
• GABA — The main inhibitory neurotransmitter. Reduces neuronal excitability. Linked to anxiety regulation.

Brain structures and behaviour:

• Amygdala — Processes emotions, especially fear. Lesion studies show it is critical for fear conditioning.
• Hippocampus — Essential for forming new episodic memories. The famous case of Patient H.M. demonstrated that removing the hippocampus eliminates the ability to form new long-term memories.
• Prefrontal cortex — Involved in decision-making, planning, and impulse control. Damage leads to personality changes (as in the case of Phineas Gage).
• Hypothalamus — Regulates hunger, thirst, body temperature, and the endocrine system via the pituitary gland.

The fight-or-flight response: When a threat is detected, the amygdala signals the hypothalamus, which activates the sympathetic nervous system and the HPA (hypothalamic-pituitary-adrenal) axis. Adrenaline and cortisol are released, increasing heart rate, blood pressure, and glucose availability. This response is adaptive in the short term but can be harmful if chronically activated (chronic stress).

• Brain imaging — fMRI, PET scans, EEG, and lesion studies allow researchers to observe brain activity and link structures to functions.
• Animal studies — Enable investigation of brain structures through lesioning and stimulation, but raise ethical concerns about animal welfare.
• Twin studies — Compare concordance rates between monozygotic (identical) and dizygotic (fraternal) twins to estimate the heritability of traits.

• Maguire et al. (2000) — London taxi drivers had larger posterior hippocampi compared to controls, demonstrating experience-dependent neuroplasticity.
• Kluver and Bucy (1997) — Bilateral lesion of the temporal lobes (including amygdala) in monkeys produced “psychic blindness,” hyperorality, and flattened emotional responses.
• Gage (1848) — Phineas Gage survived an iron rod passing through his frontal lobe but experienced profound personality changes, providing early evidence for the role of the prefrontal cortex in personality and decision-making.

The cognitive level of analysis focuses on mental processes — how we perceive, remember, think, and solve problems. Cognitive psychology treats the mind as an information-processing system, using models and metaphors from computing to understand internal mental operations.

Models of memory:

• Multi-store model (Atkinson and Shiffrin, 1968): Memory consists of three stores — sensory memory, short-term memory (STM), and long-term memory (LTM). Information flows through these stores in a linear fashion, with rehearsal enabling transfer from STM to LTM.
• Working memory model (Baddeley and Hitch, 1974): STM is not a single store but a multi-component system consisting of the central executive, phonological loop, visuospatial sketchpad, and (later) episodic buffer.
• Levels of processing (Craik and Lockhart, 1972): Deeper (semantic) processing leads to better retention than shallow (structural or phonemic) processing.

Cognitive biases and heuristics:

• Confirmation bias — The tendency to seek, interpret, and remember information that confirms pre-existing beliefs
• Anchoring bias — Over-relying on the first piece of information encountered when making decisions
• Availability heuristic — Judging the probability of events based on how easily examples come to mind
• Framing effect — The way information is presented influences decision-making (e.g. “90% survival rate” vs “10% mortality rate”)

Cognitive development:

• Piaget’s stages of cognitive development — Sensorimotor (0-2), Preoperational (2-7), Concrete operational (7-11), Formal operational (11+). Each stage is characterised by qualitatively different ways of thinking.
• Vygotsky’s sociocultural theory — Cognitive development is fundamentally social. The zone of proximal development (ZPD) represents the gap between what a learner can do alone and what they can achieve with guidance.

• Laboratory experiments — Control variables precisely, enable causal conclusions, but lack ecological validity.
• Case studies — Provide detailed insight into rare conditions (e.g. patient H.M., patient Clive Wearing), but generalisability is limited.
• Natural experiments — Exploit naturally occurring variations, balancing ecological validity with some control.
• Correlational studies — Measure the strength and direction of relationships between variables, but cannot establish causation.

• Miller (1956) — “The Magical Number Seven, Plus or Minus Two” demonstrated that STM has a limited capacity of approximately 7 (±2) chunks of information.
• Loftus and Palmer (1974) — Demonstrated that leading questions can alter memory for events, with “smashed” producing higher speed estimates than “contacted” in a car accident study.
• Bandura (1961) — The Bobo doll experiment showed that children learn aggressive behaviour through observation and imitation, supporting social learning theory.

The sociocultural level of analysis examines how social and cultural factors influence individual behaviour. This approach recognises that humans are fundamentally social beings whose behaviour is shaped by group membership, cultural norms, social interactions, and institutional structures.

Conformity: Adjusting behaviour or beliefs to match those of a group. Asch (1951) demonstrated that approximately 75% of participants conformed to an obviously incorrect group answer at least once in a line judgement task. Conformity serves to maintain social harmony and gain acceptance, but can lead to poor decision-making in group contexts.

Obedience: Following direct orders from an authority figure. Milgram (1963) showed that 65% of participants administered the maximum 450V shock when instructed by an experimenter in a lab coat. Obedience is influenced by authority proximity, the presence of dissenting peers, and the perceived legitimacy of the authority figure.

Social identity theory (Tajfel and Turner, 1979): People categorise themselves and others into in-groups and out-groups. Social identity is derived from group membership, and people tend to favour their in-group even when group assignment is arbitrary (minimal group paradigm).

Culture and behaviour:

• Individualistic cultures — Emphasise personal achievement, independence, and individual rights (e.g. USA, UK, Australia)
• Collectivistic cultures — Emphasise group harmony, interdependence, and social obligations (e.g. Japan, China, many African and Latin American countries)
• Cultural differences affect attribution style, self-concept, memory, and even perception

• Field experiments — Conducted in natural settings, higher ecological validity but less control over extraneous variables
• Cross-cultural studies — Compare behaviour across different cultures to distinguish universal from culture-specific phenomena
• Observational studies — Systematic observation of behaviour in natural social contexts

• Asch (1951) — Conformity experiment using line judgement tasks. Found that group pressure significantly influenced individual responses, even when the correct answer was obvious.
• Milgram (1963) — Obedience experiment. Participants were instructed to administer electric shocks to a confederate. 65% obeyed to the maximum voltage.
• Tajfel et al. (1971) — Minimal group paradigm. Boys were randomly assigned to groups based on preference for Klee or Kandinsky paintings. Even with arbitrary group assignment, participants allocated more resources to in-group members.

Understanding research methods is assessed in both Paper 1 and Paper 2, and is essential for the IA. Key areas include:

• Experimental method — Manipulation of an independent variable (IV) to observe its effect on a dependent variable (DV), with control of extraneous variables. Can be lab-based, field-based, or natural.
• Correlational method — Measures the relationship between two variables without manipulation. Reported as a correlation coefficient (r) ranging from -1 to +1.
• Case study — In-depth investigation of an individual, group, or event. Combines multiple data sources (interviews, observations, psychometric tests).
• Naturalistic observation — Behaviour is observed and recorded in its natural setting without manipulation.
• Survey method — Uses questionnaires or interviews to collect data from a sample about attitudes, beliefs, or behaviours.

• Reliability — Consistency of a measure. A reliable test produces similar results on repeated occasions. Internal consistency (Cronbach’s alpha) and test-retest reliability are key metrics.
• Validity — Whether a test measures what it claims to measure. Internal validity (confidence in causal conclusions), external validity (generalisability to real-world settings), and ecological validity (relevance to everyday situations) are all important.

The IB follows ethical guidelines that include:

• Informed consent — Participants must be told what the study involves and agree to participate
• Right to withdraw — Participants can leave at any time without penalty
• Confidentiality — Personal data must be protected
• Protection from harm — Researchers must minimise physical and psychological risk
• Debriefing — Participants must be fully informed about the study’s purpose after participation
• Deception — Only used when absolutely necessary and must be followed by full debriefing

• Random sampling — Every member of the population has an equal chance of being selected. Reduces bias but may not be representative.
• Stratified sampling — The population is divided into subgroups (strata) and random samples are taken from each. Ensures representation of key subgroups.
• Opportunity sampling — Selecting participants who are readily available. Quick and easy but prone to bias.
• Volunteer (self-selected) sampling — Participants choose to take part. May attract people with particular characteristics.

A strong IB Psychology essay follows this structure:

1. Introduction (1-2 sentences): Define key terms and outline what you will discuss
2. Topic sentence 1: State your first argument with reference to research
3. Evidence: Describe the study (aim, method, findings)
4. Analysis: Explain how the evidence supports your argument
5. Evaluation: Discuss strengths and limitations of the research
6. Topic sentence 2: State your second argument
7. Evidence: Describe a second study
8. Analysis and evaluation: As above
9. Counterargument: Present an opposing view or limitation
10. Conclusion: Summarise your argument and provide a final judgement

1. Learn key studies thoroughly — Know the researcher names, dates, aims, methods, findings, and conclusions for the most important studies. These are essential for essay writing.

2. Use the levels of analysis framework — Always consider how biological, cognitive, and sociocultural factors interact. The best essays integrate multiple levels.

3. Practice applying theory to real-world examples — Exam questions often ask you to apply psychological theories to specific scenarios. Practise linking abstract concepts to concrete examples.

4. Master research methods — Understanding methodology is assessed across all papers and is crucial for the IA. Know the strengths and limitations of different research designs.

5. Use command terms precisely — “Discuss” means present a balanced argument; “evaluate” means make a judgement; “explain” means give reasons. Using these terms incorrectly costs marks.

6. Plan your essays — Before writing, spend 3-5 minutes planning your essay structure. Identify the key points you will make, the studies you will cite, and the evaluation you will include.

7. Read the marking criteria — Understanding exactly what the examiner is looking for helps you target your responses. Pay attention to the distinction between 7-level and 4-level responses.

8. Review flashcards regularly — Use the flashcard sets provided for each topic to reinforce key terms, studies, and concepts through active recall.

• Describing studies instead of using them as evidence: Examiners want you to apply research to support your arguments, not simply summarise what a study found. Always link the study back to the question.

• Ignoring the evaluation component: Every essay should include evaluation of both supporting and opposing evidence. Failing to evaluate is one of the most common reasons for losing marks.

• Confusing correlation with causation: A correlational study does not demonstrate that one variable causes another. Always be precise about the type of conclusion that can be drawn from a given research design.

• Omitting ethical considerations in the IA: The IA marking criteria reward thorough ethical reasoning. Always discuss how you addressed consent, confidentiality, and protection from harm.

• Using too few studies: Essays that reference only one or two studies tend to lack depth. Aim to discuss at least two to three relevant studies per point.

• Abnormal Psychology: Classification of psychological disorders, approaches to understanding and treating abnormality.
• Biological Level of Analysis: Neurotransmitters, brain structures, genetics, and biological research methods.
• Cognitive Level of Analysis: Memory models, cognitive biases, thinking, and problem-solving.
• Developmental Psychology: Lifespan development, attachment, and cognitive growth.
• Research Methods: Experimental design, reliability, validity, and ethics.
• Qualitative Research: Interviews, focus groups, thematic analysis, and interpretive phenomenological analysis.
• Sociocultural Level of Analysis: Conformity, obedience, social identity, and cultural influences.

• Psychology by Myers and DeWall (comprehensive IB-aligned textbook)
• Thinking, Fast and Slow by Daniel Kahneman (accessible introduction to cognitive psychology)
• Influence: The Psychology of Persuasion by Robert Cialdini (social psychology in everyday life)
• The Man Who Mistook His Wife for a Hat by Oliver Sacks (case studies in neuropsychology)
• Stumbling on Happiness by Daniel Gilbert (cognitive biases in everyday life)

Keep practising and reviewing to master this topic.