What does Edexcel Psychology Topic 4 The brain and neuropsychology cover?

Topic 4 asks how your brain affects you. It covers the structure and function of the brain (the four lobes, cerebellum and brain stem), the lateralisation of function across the two hemispheres, the structure and function of neurons and synaptic transmission, the impact of neurological damage on movement and behaviour, and the core studies by Sperry (1968) and Damasio et al. (1994). It is examined in Paper 1.

What are the core studies for Topic 4?

The named core studies are Sperry (1968), who studied split-brain patients whose corpus callosum had been cut and revealed lateralisation (the left hemisphere could name objects but the right could not speak), and Damasio et al. (1994), who reconstructed the path of the iron bar through Phineas Gage's skull and linked frontal-lobe damage to changes in decision making and emotion. You must know each to four parts plus evaluation.

What is lateralisation of function?

Lateralisation means the two hemispheres of the brain are specialised for different functions. In most people the left hemisphere is dominant for language, while the right hemisphere is more involved in spatial and visual tasks and recognising faces. Each hemisphere controls the opposite side of the body, and the two communicate through the corpus callosum.

How should I revise Topic 4?

Learn the four lobes and their functions, the cerebellum and brain stem, and lateralisation with the corpus callosum. Secure synaptic transmission as an ordered sequence, and the effects of neurological damage (the opposite-side rule, frontal-lobe personality change). Then learn the Sperry and Damasio core studies to four parts plus evaluation, and practise describe, explain and evaluate questions, including evaluating case studies.

EnglandPsychology

Edexcel GCSE Psychology Topic 4 The brain and neuropsychology: a complete overview of structure, neurons and the studies

Q: How does a message pass between neurons?

Within a neuron the message is an electrical impulse travelling along the axon. Between neurons there is a tiny gap called the synapse, which the message crosses chemically: the impulse triggers the release of neurotransmitters that diffuse across the gap and bind to receptors on the next neuron, which can trigger a new impulse. Many drugs work by changing what happens at the synapse.

A deep-dive Edexcel GCSE Psychology guide to Topic 4, The brain and neuropsychology. Covers the structure and function of the brain, lateralisation, neurons and synapses, the impact of neurological damage, and the Sperry and Damasio core studies.

Generated by Claude Opus 4.815 min read1PS0 Topic 4Updated 2026-06-02

Reviewed by: AI editorial process; not yet individually human-reviewed

Jump to a section

What Topic 4 actually demands
The structure and function of the brain
Neurons and synapses
Neurological damage and the core studies
How Topic 4 is examined
Check your knowledge

What Topic 4 actually demands

The brain and neuropsychology asks the guiding question "how does your brain affect you?". It runs from the large-scale structure of the brain, through how individual neurons carry messages, to what happens when the brain is damaged, and finishes with two core studies. Edexcel tests precise biological knowledge and the ability to evaluate the case-study evidence.

This guide walks through the topic in specification order, then sets out the exam patterns. Each part has a matching dot-point page with practice questions; this overview ties them together.

The structure and function of the brain

The cerebrum is split into two hemispheres and four lobes: frontal (thinking, planning, movement), parietal (touch and spatial sense), temporal (hearing, memory, language) and occipital (vision). The cerebellum coordinates balance and movement, and the brain stem controls vital functions like breathing. Lateralisation means the hemispheres are specialised, communicating through the corpus callosum.

Neurons and synapses

Within a neuron, the message is an electrical impulse travelling along the axon (sped up by the myelin sheath). Between neurons lies the synapse, which the message crosses chemically: the impulse triggers the release of neurotransmitters that diffuse across and bind to receptors on the next neuron, which can fire a new impulse. This is the mechanism behind drug treatments such as SSRIs.

Neurological damage and the core studies

Neurological damage (from injury or stroke) affects movement (the opposite-side rule, cerebellum damage causing poor coordination) and behaviour (frontal damage changing personality), and reveals the localisation of function. The two core studies anchor this: Sperry (1968) revealed lateralisation in split-brain patients, and Damasio et al. (1994) reconstructed Phineas Gage's skull to link the frontal lobe to decision making and emotion. A strong answer evaluates the use of case studies (rich but small, unusual samples).

How Topic 4 is examined

A typical Edexcel profile for Topic 4:

Multiple choice and short answer. Naming a lobe, or identifying the synapse.
Describe questions. The function of the four lobes, or the structure of a neuron.
Explain questions. How a message crosses the synapse, or how damage reveals localisation.
Extended response. Evaluating the use of case studies such as Sperry and Damasio, with a balanced judgement and credit for written communication.

Check your knowledge

A mix of recall and applied questions covering Topic 4. Attempt them under timed conditions, then check against the solutions.

Describe the function of the four lobes of the cerebrum. (4 marks)
Explain what is meant by the lateralisation of function. (3 marks)
Describe the structure of a neuron. (3 marks)
Explain how a message passes from one neuron to another across a synapse. (4 marks)
Describe the method used in Sperry's (1968) study. (4 marks)
Explain how brain-damage case studies support localisation of function. (4 marks)
Explain one strength and one weakness of using case studies to understand the brain. (4 marks)

Solutions

Q1: Frontal (thinking, planning, movement); parietal (touch and spatial awareness); temporal (hearing, memory, language); occipital (vision).
Q2: Lateralisation means the hemispheres are specialised: the left is usually dominant for language, the right for spatial tasks and faces. Each controls the opposite side of the body, and they link via the corpus callosum.
Q3: A neuron has a cell body (with nucleus), dendrites (receive signals), and an axon (carries the impulse away), often covered by a myelin sheath that speeds the impulse.
Q4: The impulse reaches the axon terminal and triggers the release of neurotransmitters into the synapse; they diffuse across and bind to receptors on the next neuron, which can fire a new impulse.
Q5: Sperry tested split-brain patients (cut corpus callosum), flashing information to one visual field so it reached one hemisphere, and asked them to name it or select it by touch, testing each hemisphere alone.
Q6: Damage to a specific area causes a specific, predictable loss (for example losing fluent speech) while sparing other functions, which suggests that function was located in the damaged area.
Q7: Strength: case studies give rich, real data about rare conditions that cannot be created experimentally for ethical reasons. Weakness: they use small, unusual samples, so findings may not generalise.

Sources & how we know this

Pearson Edexcel GCSE (9-1) Psychology (1PS0) specification — Pearson Edexcel (2017)