Pearson Edexcel A Level Psychology (9PS0)

Complete Specification — A/A* Revision Notes

Assessment

Paper 1 — Foundations in Psychology

Content:

• Social Psychology
• Cognitive Psychology
• Biological Psychology
• Learning Theories
• embedded issues/debates

Current timing from June 2026:

• 2 hours 15 minutes
• 90 marks
• 35%

Paper 2 — Applications of Psychology

Compulsory:

• Clinical Psychology

Choose one:

• Criminological Psychology
• Child Psychology
• Health Psychology

Current timing from June 2026:

• 2 hours 15 minutes
• 90 marks
• 35%

Paper 3 — Psychological Skills

• methods

• review of studies

• issues/debates

• synoptic application

• 2 hours

• 80 marks

• 30%

Topic 1 — Social Psychology

Obedience

Milgram

Know:

• aims;
• baseline procedure;
• sample;
• shock generator;
• experimenter prods;
• quantitative/qualitative findings;
• conclusion.

Core explanation: situational pressure and perceived authority can produce high obedience.

Evaluation:

• high standardisation;
• replication;
• deception/distress;
• ecological validity;
• demand-characteristic debate;
• sample/culture.

Agency and authority

Agentic state: responsibility displaced to authority.

Legitimate authority: socially recognised power structure.

Situational factors:

• proximity;
• authority setting;
• presence of dissent.

Prejudice

Social identity theory

Process:

1. social categorisation;
2. social identification;
3. social comparison.

In-group favouritism can support positive social identity.

Realistic conflict theory

Competition over scarce resources can produce intergroup hostility.

Superordinate goals can reduce conflict.

Evaluation:

• field/lab evidence;
• artificial groups;
• culture;
• individual differences.

Key Question

Students apply Social Psychology to a contemporary real-life social issue.

Strong answer:

• define issue;
• apply at least two concepts/theories;
• use research;
• judge usefulness.

Methods in Social Psychology

Especially:

• questionnaires/interviews;
• qualitative vs quantitative;
• sampling;
• ethics.

Topic 2 — Cognitive Psychology

Memory Models

Multi-store model

Sensory → STM → LTM.

STM: limited duration/capacity, often acoustic coding.

LTM: long duration/capacity, often semantic coding.

AO3: use empirical support and limitations of unitary stores.

Working memory model

• central executive;
• phonological loop;
• visuo-spatial sketchpad;
• episodic buffer.

Useful for dual-task performance and brain-damage evidence.

Episodic and semantic memory

Episodic: events.

Semantic: facts/general knowledge.

Reconstructive Memory

Memory is actively reconstructed using:

• schemas;
• expectations;
• post-event information.

Bartlett

Schema-driven reconstruction and cultural expectations.

Eyewitness research

Leading questions and misinformation alter recall.

Brain-Damaged Case Studies

Use to infer memory-system dissociations.

Strength: rare natural evidence.

Weakness: lesion extent/history confounds; low generalisation.

Key Question

Apply cognitive theories to a real issue such as eyewitness evidence, revision or memory enhancement.

Methods

Laboratory experiments, case studies, data analysis and experimental design.

Topic 3 — Biological Psychology

Nervous System and Neurotransmission

Neurons communicate electrically and chemically.

Synaptic transmission:

1. action potential;
2. neurotransmitter release;
3. receptor binding;
4. excitation/inhibition;
5. removal.

Recreational Drugs

Explain effects through neurotransmitter systems and synapses.

Distinguish:

• agonist;
• antagonist;
• reuptake effects.

Brain Structure and Function

Know:

• localisation;
• lateralisation;
• aggression-related structures;
• prefrontal/limbic systems.

Hormones and Aggression

Testosterone and other biological factors may correlate with aggression.

Avoid deterministic conclusions.

Evolution and Aggression

Behaviour may be understood through adaptive reproductive/resource functions.

Evaluation: post-hoc reasoning; cultural variability; interaction with learning.

Freud / Psychodynamic Content

Id, ego, superego and unconscious drives can be linked to aggression/personality as specified.

Methods

• brain scanning: CAT, PET, fMRI;
• twin studies;
• adoption studies;
• correlations;
• case studies;
• animal research.

Twin/adoption

Used to separate genetic/environmental contributions but assumptions such as equal environments are contestable.

Key Question

Apply biological explanations to a contemporary issue such as drug effects or aggression.

Topic 4 — Learning Theories

Classical Conditioning

Learning by association.

Terms:

• UCS;
• UCR;
• NS;
• CS;
• CR.

Processes:

• acquisition;
• extinction;
• spontaneous recovery;
• generalisation;
• discrimination.

Operant Conditioning

Behaviour shaped by consequences.

• positive reinforcement;
• negative reinforcement;
• punishment.

Schedules and shaping can be applied.

Social Learning Theory

• observation;
• imitation;
• modelling;
• identification;
• vicarious reinforcement;
• mediational processes.

Phobias

Acquisition through classical conditioning; maintenance through operant negative reinforcement.

Treatment:

• systematic desensitisation;
• flooding;
• exposure-based approaches.

Evaluate learning explanations with biological preparedness/cognitive factors.

Animal Research

Consider:

• scientific control;
• species generalisation;
• ethics.

Key Question

Apply conditioning to health, education, behaviour change or phobia treatment.

Methods

Observation, animal laboratory experiments, content/thematic analysis as relevant.

Topic 5 — Clinical Psychology

This topic is compulsory.

Defining and Diagnosing Mental Disorder

The four Ds:

• deviance;
• distress;
• dysfunction;
• danger.

Classification systems:

• DSM;
• ICD.

Evaluate:

• reliability;
• validity;
• cultural bias;
• gender bias;
• comorbidity;
• labelling.

Rosenhan

Classic challenge to psychiatric diagnosis.

Know:

• pseudopatient procedure;
• admission;
• interpretation of normal behaviour as pathological;
• implications.

Evaluate historical relevance and changes in modern classification.

Schizophrenia

Features:

• positive symptoms;
• negative symptoms;
• cognitive/disorganised symptoms where appropriate.

Explanations from at least differing perspectives:

• biological;
• cognitive;
• social/learning/psychodynamic where specified.

Biological:

• dopamine;
• genes;
• brain abnormalities.

Psychological:

• cognitive processing;
• family/social factors.

Treatments from different approaches:

• antipsychotic drugs;
• CBT;
• family interventions;
• other specified therapy.

Evaluate:

• effectiveness;
• side effects;
• ethics;
• relapse;
• reductionism.

Second Disorder — choose one in teaching

Pearson allows:

• unipolar depression;
• OCD;
• anorexia nervosa.

This master includes all three.

Unipolar Depression

Symptoms:

• low mood;
• anhedonia;
• cognitive/behavioural changes.

Explanations:

• biological;
• cognitive;
• learning.

Treatments:

• antidepressants;
• CBT.

OCD

Obsessions + compulsions.

Explanations:

• serotonin/genetics;
• cognitive beliefs/learning.

Treatments:

• SSRIs;
• CBT/ERP.

Anorexia Nervosa

Restricted eating and distorted body/eating cognitions.

Explanations:

• biological;
• cognitive/social-cultural.

Treatments:

• psychological;
• medical/nutritional support.

Methods in Clinical Psychology

• case studies;
• interviews;
• content analysis;
• cross-cultural;
• longitudinal;
• cross-sectional;
• meta-analysis;
• primary/secondary data.

HCPC / Professional Ethics

Consider professional practice:

• competence;
• confidentiality;
• informed consent;
• safeguarding;
• evidence-based treatment.

Key Question

A contemporary mental-health issue must be explained using psychology and evaluated.

Topic 6 — Criminological Psychology (OPTION)

Explanations of Crime

Biological

• genes;
• brain;
• hormones.

Learning

• operant reinforcement;
• social learning;
• differential association-style social exposure.

Cognitive

• distortions;
• hostile attribution;
• moral reasoning.

Evaluate interactionist approaches.

Understanding the Offender

Assessment/profiling through psychological characteristics and risk factors.

Jury Decision Making

Witness/defendant characteristics can bias verdicts.

Factors:

• attractiveness;
• race/culture;
• accent;
• confidence;
• prior information.

Treatment of Offenders

CBT / Anger Management

Identify triggers and cognitive distortions, develop coping/reappraisal.

Token Economy

Institutional behaviour shaped by reinforcement.

Restorative approaches

Repair harm through structured offender-victim/community processes.

Evaluate recidivism, ethics, practicality.

Methods

Experiments, observations, interviews, offender case studies, quantitative data.

Topic 7 — Child Psychology (OPTION)

Attachment

Bowlby

• attachment adaptive;
• monotropy;
• internal working model;
• sensitive period.

Ainsworth

Strange Situation:

• secure;
• insecure-avoidant;
• insecure-resistant.

Cross-cultural attachment research: evaluate imposed etic and sampling.

Deprivation / Institutional Care

Effects of disrupted/absent attachment.

Consider:

• cognitive;
• social;
• emotional outcomes;
• recovery/plasticity.

Cognitive Development

Development changes thinking and social understanding.

May include:

• object permanence;
• theory of mind;
• developmental progression.

Autism / Developmental Differences

Use respectful language; discuss cognitive/social developmental research without reducing autism to a single deficit.

Research with Children

Ethics:

• parental consent;
• assent;
• protection;
• right to withdraw;
• safeguarding.

Methods:

• longitudinal;
• cross-sectional;
• observation;
• meta-analysis.

Key Question

Apply child psychology to childcare, education, advertising or development.

Topic 8 — Health Psychology (OPTION)

Drugs and Addiction

Why people start/continue:

• biological;
• learning;
• social;
• cognitive.

Dependence:

• tolerance;
• withdrawal;
• craving.

Alcohol / Nicotine / Recreational Drugs

Explain using:

• neurotransmitters;
• reinforcement;
• social norms;
• expectancies.

Stress and Health

Stress can affect:

• immune;
• cardiovascular;
• behavioural health pathways.

Individual differences and social support moderate effects.

Health Behaviours

Models can explain:

• adherence;
• risky behaviour;
• prevention;
• exercise/diet.

Interventions

• pharmacological;
• behavioural;
• cognitive;
• public health.

Evaluate effectiveness, ethics, relapse and generalisability.

Methods

• questionnaires;
• interviews;
• animal research;
• cross-cultural designs;
• qualitative/quantitative.

Topic 9 — Psychological Skills

Topic 9 integrates methodology and issues/debates from Topics 1–8.

Review of Research Methods

Experimental

• lab;
• field;
• IV/DV;
• controls;
• repeated/independent/matched.

Non-experimental

• correlation;
• observation;
• questionnaire;
• interview;
• case study;
• longitudinal;
• cross-sectional;
• cross-cultural;
• meta-analysis.

Sampling

Pearson requires:

• random;
• stratified;
• opportunity;
• volunteer.

Hypotheses

• alternative;
• null;
• directional;
• non-directional;
• one-tailed;
• two-tailed.

Variables

• independent;
• dependent;
• extraneous;
• confounding;
• participant;
• situational;
• operationalisation.

Data

• quantitative;
• qualitative;
• primary;
• secondary.

Descriptive Statistics

• mean;
• median;
• mode;
• range;
• standard deviation;
• normal distribution;
• frequency tables;
• histograms;
• bar charts.

Inferential Tests

Pearson requires non-parametric tests:

• chi-square;
• Mann–Whitney U;
• Wilcoxon;
• Spearman's rho.

Select by:

• difference/association;
• related/unrelated;
• level of measurement.

Understand:

• observed vs critical value;
• significance;
• Type I;
• Type II.

Qualitative Analysis

• thematic analysis;
• grounded theory.

Evaluation

• reliability;
• validity;
• credibility;
• generalisability;
• objectivity;
• subjectivity.

Peer Review

Experts evaluate:

• methods;
• analysis;
• novelty;
• interpretation; before/after publication.

Limitations:

• bias;
• conservatism;
• fraud may escape detection;
• publication bias.

Issues and Debates

Pearson embeds issues/debates across topic areas.

Ethics

Human and animal research.

Practical Issues

Cost, time, access, measurement.

Reductionism

Explaining complex behaviour at a simpler level.

Psychology as a Science

• empirical;
• objective;
• replicable;
• falsifiable.

Culture

Ethnocentrism and cross-cultural validity.

Gender

Bias and differences in theory/research.

Nature–Nurture

Interaction increasingly favoured over extremes.

Social Control

Psychological knowledge can be used to manage/control behaviour.

Use of Psychology in Society

Applications in:

• health;
• crime;
• education;
• therapy.

Socially Sensitive Research

Potential consequences for groups and policy.

Development Over Time

Theories, methods, ethics and classification systems evolve.

Study Revision Schema

Each classic/contemporary Pearson study should be stored as:

Edexcel Exam Language

Explain

A point must include justification:

“This lowers validity because…”

Assess / Evaluate

Develop both strengths and weaknesses and reach a justified conclusion.

Application

AO2 requires repeated use of scenario detail, not one token reference.

20-mark Clinical Essay

A top answer:

1. defines focus;
2. accurate detailed AO1;
3. sustained AO3;
4. compares explanations/treatments where relevant;
5. embeds issues/debates;
6. reaches judgement.

Common Lost Marks

• describing a strength/weakness without explaining its consequence;
• failing to apply scenario throughout AO2;
• correlation claimed as cause;
• reliability confused with validity;
• generic ethical points not linked to procedure;
• saying DSM/ICD are treatments rather than classification systems;
• treating schizophrenia as a single symptom;
• describing a biological correlation as proof of biological cause;
• saying classical conditioning explains maintenance without operant reinforcement;
• using a parametric test where Pearson expects one of specified non-parametric tests;
• forgetting Paper 3 is synoptic and can use studies/issues from any topic.