The big idea: Some things cannot be tested on people first. So psychologists sometimes study animals to learn about humans. An animal used this way is called an animal model.
An animal model works because humans and many animals share similar biology. A rat's brain is far simpler than yours, but many of its basic parts and chemicals work in similar ways.
This lets researchers study a process in an animal and then carefully generalize the findings to people.
Why psychologists sometimes study animals
Similar biology
Many animals share brain parts and chemical messengers with humans, so a process can be studied in a simpler system.
More control
Researchers can control an animal's environment, diet and breeding far more tightly than they ever could with people.
Safety first
A new drug or an invasive method can be tested on animals before it is ever tried on a human.
Faster life cycles
Animals like mice live and breed quickly, so effects across a whole life or several generations can be seen sooner.
Similar biology → Control → Safety first → Faster
Memory hook: Model, then people. An animal model is a stand-in — we study it to understand something that also happens in humans.
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The chain of reasoning: Animal research follows a careful chain: study the animal → find a result → check it could apply to humans → then test in people. The last steps matter, because animals and humans are not the same.
Let us walk through one clear example. Imagine researchers have a new medicine that might ease anxiety. They cannot give an untested medicine to people, because it could be harmful.
So they first study it in mice. If the mice show less stress behaviour and stay healthy, that is a promising sign. Only then, and with great care, might the medicine move to small human trials.
Imagine you are there: A team watches two groups of mice. One group is given the new medicine, the other is not. The treated mice explore calmly, while the others freeze more often. It is a hopeful result — but the team knows a mouse is not a person, so they treat it as a first step, not proof.
This is why researchers generalise with caution. A result in an animal is a strong clue about humans, not a certainty.
What is an animal model?
An animal studied as a stand-in for a human process — for example, using rats to study how stress affects the body.
What does 'generalise' mean?
Taking a finding from one group (the animals) and applying it to another (humans). It must be done carefully.
Why be cautious?
Animals and humans share a lot, but also differ. A finding may not fully transfer, so human testing is still needed.
Exam tip: A strong answer names the animal model, explains the shared biology that makes it useful, and adds that findings must be generalised to humans with care.
Learn what examiners really want
See exactly what to write to score full marks. Our AI shows you model answers and the key phrases examiners look for.
The concept behind it: Using animals raises the concept of responsibility. Researchers have power over the animals, so they must act ethically — weighing the good a study may do against the cost to the animals. Because of this, animals are used only when the likely benefit is high and there is no good non-animal alternative.
To guide this, scientists follow the 3Rs. These rules aim to protect animal welfare at every stage.
Researchers also carry out a cost-benefit analysis before they begin, and follow strict welfare guidelines. Now weigh the whole approach:
Strengths of animal research
- Conditions can be tightly controlled, so it is easier to show causality
- Lets risky or invasive methods be tested safely first
- Shared biology means many findings do transfer to humans
- Animals like mice live and breed quickly, so effects over a whole life — or passed on to their young — show up much sooner
Limits and concerns
- Animals differ from humans, so findings may not fully generalise
- It raises real ethical concerns about animal suffering
- Simple animal behaviour cannot capture complex human thought or culture
- The findings often have to be checked in humans anyway, which costs extra time and money
Studies are just examples: You do not need to memorise a famous animal study. You can explain animal research with a real study or a made-up example (like the anxiety-medicine mice). Both score full marks as long as the point is clear.
Real examples you could use: You do not have to memorise named studies, but a real one makes a strong example. Researchers have used animal models to study, for example:
• aggression in mice (Cases et al., 1995; Van Oortmerssen & Bakker, 1981)
• OCD in mice (Shmelkov et al., 2010)
• stress in mice (Weaver et al., 2005)
• depression and the 5-HTT gene in macaque monkeys (Xu et al., 2015)
Any one of these — or a made-up example — works in the exam, as long as you explain it clearly.
How to reach the top marks: The best answers evaluate: weigh a real strength (control, safety) against a real limit (species differences, ethics), then reach a short, clear judgement.
How Paper 1 tests this: Animal research is biological-approach content. On Paper 1 this term is tested in two ways:
• 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 big [15] essays are concept-framed and come in the four contexts. This term can support one — for example, the responsibility of using animals in health research.
A company wants to test whether a new drug reduces stress before trying it on people. Explain how an animal model could be used, and one limitation.
Model answer plan
See the mark-by-mark plan — for / against / judgement, with marking guidance — in study mode.
Common mistakes: 1. Describing, not applying. In the applied [6], use the term to explain the given scenario — do not just describe animal research in general.
2. Forgetting the ethics. For this term, the concept of responsibility and the 3Rs are central.
3. No example or no development. Ground your point in one clear example and develop it (for example, add a limitation).
4. Treating animal results as certain. Always mention generalising to humans with care.