Edexcel A-Level Psychology Paper 1 (Foundations): Social, Cognitive, Biological and Learning
Edexcel A-Level Psychology Paper 1 (Foundations): Social, Cognitive, Biological and Learning
Paper 1 of Edexcel A-Level Psychology (9PS0/01), Foundations in Psychology, is the intellectual bedrock of the whole qualification. It teaches the four explanatory approaches that every later topic depends on: social, cognitive, biological and learning psychology. Get these four right and Papers 2 and 3 become an exercise in application; get them shaky and everything downstream wobbles.
This guide walks through all four approaches — the theories, the classic studies with their correct dates, the evaluation points that earn AO3 marks, and the exam technique that turns knowledge into grades. For the wider picture of how Paper 1 fits into the qualification, start with the complete 9PS0 guide; to study each approach in full, follow the Edexcel A-Level Psychology learning path.
Paper 1 at a Glance
Paper 1 is a two-hour written exam worth 90 marks and 35% of the A-Level. It ranges across all four approaches and mixes short-answer recall, application (data-response) questions, and extended-response essays. Always confirm the exact mark total, timing and question breakdown against the current official Pearson specification and sample assessment materials, which are the authoritative source.
The four approaches are assessed against three Assessment Objectives:
| AO | Focus | In practice |
|---|---|---|
| AO1 | Knowledge and understanding | Describing theories, studies and processes accurately |
| AO2 | Application | Explaining a novel scenario, source or dataset using psychology |
| AO3 | Analysis and evaluation | Weighing strengths and weaknesses; reaching supported conclusions |
A recurring theme across all four topics: description alone plateaus around the middle band. The marks that separate a good answer from a top-band one are almost always AO3 — the quality and development of your evaluation.
graph TD
P["Paper 1: Foundations (90 marks, 35%)"] --> S["Social Psychology"]
P --> C["Cognitive Psychology"]
P --> B["Biological Psychology"]
P --> L["Learning Theories"]
S --> S1["Obedience · Conformity · Prejudice"]
C --> C1["Memory models · Forgetting"]
B --> B1["Brain · Hormones · Aggression"]
L --> L1["Conditioning · SLT · Phobias"]
style P fill:#1e40af,color:#fff
style S fill:#2563eb,color:#fff
style C fill:#7c3aed,color:#fff
style B fill:#db2777,color:#fff
style L fill:#059669,color:#fff
Social Psychology
Social psychology asks how people are influenced by the presence, actions and expectations of others. Its two headline themes on Edexcel are obedience and prejudice, but you also need conformity and the factors that make people more or less likely to obey or resist. Study it in full in the social psychology course.
Obedience
The anchoring study is Milgram (1963). Participants were instructed by an authority figure to administer what they believed were increasingly severe electric shocks to a "learner". A striking 65% continued to the maximum 450 volts. Milgram concluded that ordinary people will obey destructive orders under situational pressure, not because they are cruel but because of the situation they are placed in.
Milgram's later variations (1974) systematically identified the situational factors that raise or lower obedience:
| Variation | Obedience level | Interpretation |
|---|---|---|
| Baseline (Yale lab) | 65% | Legitimate setting maximises obedience |
| Run-down office block | ~48% | Weaker authority setting reduces obedience |
| Experimenter gives orders by phone | ~21% | Proximity of authority matters |
| Teacher and learner in same room | ~40% | Proximity of victim reduces obedience |
| Presence of defiant peers | ~10% | Disobedient models license resistance |
Agency theory offers Milgram's explanation: people shift from an autonomous state (acting on their own conscience) into an agentic state in which they see themselves as instruments of an authority and displace responsibility upwards. The legitimacy of authority and the agentic shift are the concepts examiners expect you to deploy.
Evaluation. Strengths: the experimental method gives high control and the variations establish causal factors. Weaknesses: serious ethical concerns (deception, lack of informed consent, psychological harm, questionable right to withdraw); questions over ecological validity (electric-shock labs are unlike real obedience contexts, though field replications broadly support the findings); and debate over whether participants truly believed the shocks were real. A balanced answer holds the internal validity and the ethical/external-validity critiques in tension rather than dismissing the study outright.
Conformity and Prejudice
For conformity, distinguish compliance (public agreement only), identification, and internalisation (genuine private acceptance), and understand the pull of normative and informational social influence.
For prejudice, Edexcel expects competing explanations:
- Social identity theory (Tajfel and Turner, 1979) — the mere act of categorising people into in-groups and out-groups produces favouritism and discrimination, driven by the desire for positive social identity. Tajfel's minimal-group studies showed bias emerging even between arbitrarily assigned groups.
- Realistic conflict theory (Sherif, 1961; the Robbers Cave study) — prejudice intensifies when groups compete for scarce resources, and can be reduced through superordinate goals that require cooperation.
Being able to compare these two explanations — one rooted in identity, one in competition — is a reliable source of AO3 marks.
Exam technique: on a scenario question ("At a football match, rival fans…"), name the relevant social-identity or conflict process and tie it explicitly to the details in the stimulus. Generic theory with no reference to the scenario is the classic AO2 mark-loss pattern.
Cognitive Psychology
Cognitive psychology treats the mind as an information-processing system and, on Edexcel, focuses on memory — its structure, its fallibility, and why we forget. This is one of the most study-heavy topics on Paper 1. Work through it in the cognitive psychology course.
Models of Memory
The multi-store model (Atkinson and Shiffrin, 1968) proposes three separate stores through which information flows:
graph LR
A["Sensory<br/>register"] -->|attention| B["Short-term<br/>memory"]
B -->|rehearsal| C["Long-term<br/>memory"]
C -->|retrieval| B
A -.->|decay| X["Forgotten"]
B -.->|displacement / decay| X
style A fill:#2563eb,color:#fff
style B fill:#7c3aed,color:#fff
style C fill:#059669,color:#fff
style X fill:#6b7280,color:#fff
Each store differs in capacity, duration and encoding. Baddeley (1966) provided the classic evidence for encoding differences: participants found acoustically similar words hard to recall immediately (implicating acoustic coding in short-term memory) but semantically similar words hard to recall after a delay (implicating semantic coding in long-term memory). This is a study you should be able to describe and evaluate precisely.
The multi-store model's great weakness is that it treats short-term memory as a single unitary store. The working memory model (Baddeley and Hitch, 1974) replaced that with a multi-component system: a central executive directing attention, a phonological loop for sound, a visuo-spatial sketchpad for visual and spatial information, and — added later (Baddeley, 2000) — an episodic buffer integrating information across the components. Evidence for separate components comes from dual-task studies (two tasks using the same component interfere; two using different components do not) and from brain-damaged patients such as KF, whose short-term forgetting was selective.
| Feature | Multi-store model | Working memory model |
|---|---|---|
| View of STM | Single unitary store | Multi-component active system |
| Key strength | Simple; explains primacy/recency | Explains dual-task findings, case studies |
| Key weakness | Over-simplifies STM; rehearsal over-emphasised | Central executive under-specified |
Reconstructive Memory and Forgetting
Bartlett (1932) and the "War of the Ghosts" study established that memory is reconstructive: recalling an unfamiliar story, participants unconsciously altered it to fit their own cultural schemas. Memory is not a faithful recording but an active reconstruction shaped by expectation — a finding with major implications for eyewitness testimony, which you meet again in criminological psychology.
For forgetting, cover interference (proactive and retroactive), retrieval failure and the role of cues, and note the reconstruction of memory as a further source of distortion.
Evaluation. The cognitive approach is praised for rigorous, controlled laboratory methods and real-world applications (educational strategies, eyewitness reform). It is criticised for low ecological validity — remembering word lists in a lab is unlike everyday memory — and for the machine reductionism of treating the mind as a computer, which arguably neglects emotion and motivation.
Biological Psychology
Biological psychology explains behaviour through the brain, nervous system, hormones, neurotransmitters and evolution, with aggression as the anchoring application. See the biological psychology course for full coverage.
The Brain and Nervous System
You need the structure and function of the nervous system (central and peripheral, and the autonomic system's sympathetic "fight-or-flight" and parasympathetic "rest-and-digest" branches), the roles of key brain regions, and how neurons communicate at the synapse. Understand the process of synaptic transmission — an action potential triggers neurotransmitter release across the synaptic cleft, binding to receptors on the next neuron — because it underpins how drugs and imbalances affect behaviour.
Hormones and neurotransmitters implicated in aggression include testosterone (linked to aggressive behaviour), serotonin (low levels associated with impulsivity and reduced inhibition), and the stress hormone cortisol.
Explanations of Aggression
Edexcel expects both biological and evolutionary explanations of aggression:
- Brain structures — the limbic system, particularly the amygdala, in processing threat; and the prefrontal cortex in regulating impulses.
- Genetics — twin and adoption studies suggesting a heritable component, and candidate genes such as MAOA.
- Evolution — aggression as an adaptive response shaped by natural and sexual selection (competition for resources and mates).
The landmark study is Raine et al. (1997), who used PET scans to compare the brains of 41 individuals charged with murder (pleading not guilty by reason of insanity) with matched controls. The murderers showed reduced activity in the prefrontal cortex — the region associated with impulse control — supporting a neural basis for violent behaviour.
Evaluation. Strengths: biological methods (brain imaging, hormone assays) are objective and scientific, and drug and hormone evidence supports causal claims. Weaknesses: much evidence is correlational — reduced prefrontal activity may be a consequence of a violent lifestyle rather than its cause; the approach risks biological reductionism, downplaying the social and cognitive factors that learning theory captures; and there are socially sensitive implications if aggression is framed as biologically determined (bearing on free will, responsibility and the justice system). A top-band evaluation contrasts the biological account with the social learning account below — a natural synoptic move.
Going further: the debate over whether brain differences cause or merely correlate with aggression is a superb example of the "correlation is not causation" principle that runs through the whole of research methods — and exactly the kind of critical reasoning that Paper 3 rewards.
Learning Theories
Learning theories explain behaviour as acquired through experience, via classical conditioning, operant conditioning and social learning theory, with phobias as the key application. Master it in the learning theories course.
Classical Conditioning
Pavlov (1927) demonstrated learning by association. A neutral stimulus (a bell) repeatedly paired with an unconditioned stimulus (food) that naturally produces an unconditioned response (salivation) eventually becomes a conditioned stimulus that produces a conditioned response on its own.
graph LR
A["Neutral stimulus<br/>(bell)"] -->|paired repeatedly with| B["Unconditioned stimulus<br/>(food)"]
B --> C["Unconditioned response<br/>(salivation)"]
A -.->|after conditioning| D["Conditioned stimulus<br/>(bell)"]
D --> E["Conditioned response<br/>(salivation)"]
style A fill:#6b7280,color:#fff
style B fill:#2563eb,color:#fff
style D fill:#7c3aed,color:#fff
style E fill:#059669,color:#fff
The classic human demonstration is Watson and Rayner (1920), the "Little Albert" study, in which a child was conditioned to fear a white rat by pairing it with a frightening loud noise — direct evidence that phobias can be learned by association.
Operant Conditioning
Skinner showed that behaviour is shaped by its consequences. Positive reinforcement (adding a reward) and negative reinforcement (removing something unpleasant) both increase behaviour; punishment decreases it. Schedules of reinforcement (continuous versus partial) affect how quickly behaviour is learned and how resistant it is to extinction. Skinner's evidence came from tightly controlled animal studies in the "Skinner box".
Social Learning Theory
Bandura (1961) and the Bobo doll study showed that behaviour can be learned by observation and imitation, not only by direct reinforcement. Children who watched an adult behave aggressively towards an inflatable doll imitated that aggression; those who saw the model punished imitated less (vicarious reinforcement). Social learning requires four mediational processes — attention, retention, reproduction and motivation — and depends on factors such as the model's status and identification with the model.
Applying Learning Theories to Phobias
The two-process model (Mowrer, 1960) explains phobias elegantly: they are acquired through classical conditioning (an association between an object and fear, as in Little Albert) and maintained through operant conditioning (avoidance is negatively reinforced because it reduces anxiety). This directly motivates behavioural treatments — systematic desensitisation (gradual exposure paired with relaxation, using a fear hierarchy and counter-conditioning) and flooding (immediate, prolonged exposure until the fear response extinguishes).
Evaluation. Strengths: learning theories are supported by rigorous, replicable experiments and yield highly effective real-world therapies. Weaknesses: much foundational evidence comes from animal studies whose generalisability to complex human behaviour is questioned; the approach is often accused of environmental reductionism and of neglecting biological preparedness (we acquire fears of snakes and heights far more readily than fears of modern hazards, which pure conditioning struggles to explain); and it can under-play cognition, though social learning theory partially addresses this with its mediational processes.
Bringing the Four Approaches Together
The real power of Paper 1 is comparative. Aggression, for example, can be explained biologically (Raine's prefrontal findings) or through social learning (Bandura's imitation) — and a top-band essay sets those explanations against each other rather than treating them in isolation. Likewise, several debates cut across all four approaches: nature versus nurture (biological versus learning), reductionism versus holism, and free will versus determinism. Recognising these cross-cutting themes is the beginning of the synoptic reasoning that Paper 3 demands.
| Approach | Core claim | Signature study | Headline weakness |
|---|---|---|---|
| Social | Behaviour is shaped by others and by group membership | Milgram (1963) | Ethics; ecological validity |
| Cognitive | The mind processes information like a system | Baddeley (1966) | Machine reductionism; lab artificiality |
| Biological | Behaviour has a physical, evolved basis | Raine et al. (1997) | Reductionism; correlational evidence |
| Learning | Behaviour is acquired through experience | Bandura (1961) | Animal evidence; neglects biology |
Worked Model Answer: An Application Question
Application (AO2) questions are where prepared students most often leak marks, because the temptation is to write down everything you know rather than answering this scenario. Here is a specimen question modelled on the Edexcel paper format, with two responses.
"Jordan was bitten by a dog as a young child and now feels intense fear whenever he sees any dog. Using your knowledge of the two-process model, explain how Jordan's phobia was acquired and is maintained. (4 marks)"
Mid-band response (2/4): "Jordan learned his phobia through conditioning. He now avoids dogs, which keeps the phobia going."
Top-band response (4/4): "Jordan's phobia was acquired through classical conditioning: the dog (originally a neutral stimulus) was paired with being bitten (an unconditioned stimulus producing a fear response), so the dog became a conditioned stimulus that now triggers fear. The phobia is maintained through operant conditioning: when Jordan avoids dogs his anxiety falls, so the avoidance behaviour is negatively reinforced, which stops the fear from extinguishing."
Examiner-style commentary: the mid-band response gestures at the right ideas but never names the two processes or maps them onto the stimulus, so it cannot access the top marks. The top-band response earns full credit by doing three things: it splits the answer explicitly into acquisition and maintenance, it uses the precise terminology (neutral/unconditioned/conditioned stimulus; negative reinforcement), and it anchors every technical term in Jordan's specific situation (the dog, the bite, the avoidance). The discriminator here is not more knowledge — it is applied knowledge. To lift the mid-band answer, the student simply needs to name each process and tie it to the scenario.
Mastering the Key Studies
Because Paper 3 revisits Paper 1 studies and asks you to evaluate them, learning each study with its critique is the highest-value revision you can do. For every study, build a single card capturing five things:
- Aim — the question the researcher was testing.
- Method — enough procedure to describe it accurately (design, sample, key manipulation).
- Findings — the headline result, with figures where they matter (Milgram's 65%).
- Conclusion — what the researcher inferred.
- Evaluation — two strengths and two weaknesses, using GRAVE (Generalisability, Reliability, Application, Validity, Ethics).
The table below shows the evaluative "hooks" that recur most often for the core Paper 1 studies — the points examiners reward when a question says "evaluate".
| Study | A strength to cite | A weakness to cite |
|---|---|---|
| Milgram (1963) | High control; variations isolate causal factors | Serious ethical issues; questioned ecological validity |
| Baddeley (1966) | Controlled lab evidence for encoding differences | Artificial word-list task; low ecological validity |
| Bartlett (1932) | Rich evidence for reconstructive memory | Poorly controlled procedure; subjective scoring |
| Pavlov (1927) | Objective, replicable, controlled | Animal study; may not generalise to humans |
| Bandura (1961) | Controlled demonstration of observational learning | Demand characteristics; a novel toy, not real aggression |
| Raine et al. (1997) | Objective brain-imaging data | Correlational; cannot establish causation |
Rehearse turning each hook into a developed paragraph (point → evidence → explanation → implication), because in the exam the evaluation must be argued, not merely listed.
Exam Technique for Paper 1
Read the command word first. "Describe" and "Outline" are AO1; "Explain" and "Apply" are AO2; "Evaluate", "Discuss" and "Assess" are AO3-dominated. Marking your effort to the objective being tested is the single fastest way to raise a grade.
On application questions, anchor everything in the stimulus. Reference the scenario or data explicitly. An examiner should be in no doubt that you engaged with this source rather than reciting a rehearsed paragraph.
On essays, develop evaluation — do not list it. Use PEEL: make the point, give the evidence (a named study with its correct date), explain why it matters, and draw an implication. Two developed evaluation points that reach a supported conclusion beat five one-line criticisms.
Learn every key study with its date and its evaluation. Milgram 1963, Baddeley 1966, Bartlett 1932, Pavlov 1927, Bandura 1961, Raine et al. 1997 — precise dates signal precise knowledge, and in Paper 3 the evaluation of these studies is the answer.
Avoid the classic confusions. Multi-store model versus working memory model; classical versus operant conditioning; positive versus negative reinforcement (both increase behaviour). Muddling these is a frequent and easily avoided source of lost marks.
When you have the four approaches secure, carry them forward: they are the explanatory toolkit for clinical and the option topics in Paper 2, and the raw material for evaluation in Paper 3. The dedicated exam preparation course drills this technique across full timed papers.
A Realistic Revision Sequence for Paper 1
Because the four approaches vary in style — social and learning are theory-and-study heavy, cognitive is model-heavy, biological is process-heavy — a one-size-fits-all revision method leaves gaps. A sensible sequence is:
- Secure the models and processes first (multi-store versus working memory; classical versus operant conditioning; synaptic transmission). These are the parts most vulnerable to confusion under pressure, so over-learn them.
- Then build the study bank — one card per study, aim to evaluation, using GRAVE. Test yourself on the evaluation side, not just recall, because that is what Paper 3 demands.
- Then drill application — take past scenario stems and practise anchoring theory to the stimulus in timed two-to-four-minute bursts.
- Finally, write full essays to time, focusing on developed evaluation and supported conclusions.
Interleave rather than block: revisit social psychology days after you first revise it, then again weeks later. This spaced retrieval is precisely what the cognitive topic predicts will produce durable memory — a neat case of psychology explaining how to revise psychology.
Going Further
If Paper 1 sparks your interest, the four approaches open directly onto undergraduate psychology. Milgram's obedience work connects to social-psychology debates about situationism that still shape how we explain atrocities and institutional behaviour. The working memory model is a live research area in cognitive neuroscience. Raine's brain-imaging research sits at the foundation of the growing field of neurocriminology, which raises profound questions about responsibility and the justice system. And the learning tradition underpins behaviour therapy, one of the most evidence-based interventions in clinical practice. Carrying these threads forward is exactly the kind of synoptic, aspirational thinking that distinguishes the strongest A-Level candidates — and it is developed further across the Edexcel A-Level Psychology learning path.