In one line: Your brain and body never stop changing — from before birth to old age.
Biological change is happening in you right now. Reading this sentence is slightly reshaping the connections in your brain.
Change is one of the six concepts because psychology is often about how and why behaviour changes. Biological change is one big engine of it.
Memory hook: A brain is a builder, not a statue. It keeps rebuilding itself with age and experience.
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Key idea: Biological change comes from four main sources — some we're born to do, some driven by what we experience.
Sources of biological change
Maturation
The brain develops on a rough timetable — the planning region keeps maturing into the mid-20s.
Neuroplasticity
Experience reshapes connections — practise a skill and the brain strengthens those pathways.
Hormonal change
Hormones drive change, e.g. the surge at puberty reshapes body, brain and mood.
Recovery after injury
After damage, the brain can slowly re-route some functions to healthy areas.
Maturation · Plasticity · Hormones · Recovery
Take a teenager learning to drive. Maturation gives them steadier judgement over time; neuroplasticity turns clumsy first attempts into smooth habits; and calmer hormonal cycles help focus. Several biological changes work together.
Go further — higher-level insight: Change can be gradual OR sudden. Maturation is slow and steady; a hormone surge or a brain injury can change behaviour quite suddenly. Naming which kind of change a study shows is a high-level move.
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How this is tested: Change is one of the six concepts framing Paper 1 Section C and Paper 2 Section B. A common angle: explain how biological change accounts for a behaviour developing over time — name the source of change and how it works.
As the school psychologist, explain how biological change could account for why a teenager becomes much better at a musical instrument over two years of practice.
Model answer plan
See the mark-by-mark plan — for / against / judgement, with marking guidance — in study mode.
Common mistakes: 1. Just saying 'the brain changes'. Name the source (plasticity, maturation).
2. No link to the behaviour. Tie each change to the improvement.
3. Ignoring the concept. Keep the word 'change' central.