The big idea: Different parts of the brain seem to do different jobs. This idea is called localization of function — that a particular behaviour or ability is handled mainly by a particular area of the brain.
Localization of function is a core idea of the biological approach. For example, one area helps produce speech, another handles vision, and another is linked to fear.
How do psychologists find out which area does what? Mostly by studying the brain when something goes wrong, or by watching it work with a scanner.
Memory hook: Special area, special job. Localization = a specific ability is handled mainly by a specific part of the brain.
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Two main types of evidence: We work out what an area does in two main ways: by seeing what is lost when it is damaged, and by seeing what lights up when it is used.
Two ways to locate a function
Brain damage (lesions)
If a lesion removes an ability, that area was probably needed for it. Case studies of injury or stroke are a key source.
Brain imaging
A brain scan can show which area becomes active during a task, pointing to where the job is done.
Damage → loss · Scan → activity
Let us walk through one clear example. Imagine a patient who, after damage to a small area at the front-left of the brain, can no longer speak in fluent sentences — yet still understands others perfectly well.
Imagine you are there: A patient tries to answer a simple question. They know exactly what they want to say, and understand every word you say — but only a few broken words come out. Because the loss followed damage to one specific area (Broca's area), that area seems to handle speech production.
This is powerful evidence: a specific loss after specific damage points to a specific area's job. Brain imaging of healthy people speaking often shows the same area active, backing up the case study.
Exam tip: Name one area, one function, and one piece of evidence (damage or a scan). That shows you understand HOW localization is discovered, not just that it exists.
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The concept behind it: Localization raises the concept of causality. If damage to an area removes an ability, it suggests that area causes or enables the ability. But we must be careful — the truth is often more shared than a single spot.
Studies are just examples: You do not need to memorise a named patient. You can explain localization with a real case or a made-up example — both score full marks — as long as the link between the area and the function is clear.
Strengths of the idea
- Brain damage gives clear, testable links between an area and a function
- Brain imaging supports case studies with living, healthy brains
- It has real uses — for example planning safer brain surgery
- Damage-then-loss evidence supports causality
Limits of the idea
- Many behaviours use several areas working together, not one
- Case studies are often single patients, so they may not generalise
- Thanks to plasticity, other areas can sometimes take over a job
- A scan shows an area is active, not that it alone causes the behaviour
How to reach the top marks: The best answers evaluate: weigh a strength (damage/imaging evidence) against a limit (functions are often shared; plasticity), then reach a short judgement — usually that some functions are fairly localized, but many are distributed.
How Paper 1 tests this: Localization of function is biological-approach content. On Paper 1 this term is tested in two ways.
Two ways it is tested
- A short-answer question [4 marks]: describe or explain it with one example.
- An applied question [6 marks]: use it to explain a situation in a given context.
The [15] essays: The big [15] essays are concept-framed and come in the four contexts. This term can support one: for example, the concept of causality in the health and well-being context.
A patient who had a stroke can no longer produce fluent speech, although they still understand others. Explain how localization of function could account for this, and one limitation of concluding that a single area controls speech.
Model answer plan
See the answer broken into clear points, with guidance on how each point earns marks.
Common mistakes: 1. Describing, not applying. In the applied [6], explain THIS patient, not localization in general.
2. One area does everything. Remember many functions are shared across areas.
3. Scan = cause. Activity in an area does not prove it alone causes the behaviour.
4. Forgetting the concept. Tie back to causality.