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The biological approach
Key terms and introduction;

Central nervous system ­ This is made up of the brain and spinal cord
Synapse ­ Small junctions between neurons where neurotransmitters are
released and pass from the terminal button of one neuron to the dendrite
of the receiving neuron
Receptor ­ These…

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Both methods isolate genetic and environmental factors as they study people who share a
biological link, but not a common environment
Studying MZ (identical) twins is the best way to do this because the two participants share
identical genes, but a different environment ­ so similarities in behaviour due to…

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This produces a 3D `working model' of the brain and can be used to show any malfunctions (such as
tumours).
The patient is injected with a mixture of water and glucose which incorporates a radioactive isotope
that emits + radiation. It has a half life of around 109 minutes so…

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Animals in labs;

95% are rodents and birds (e.g. mice, rats and pigeons)
5% are primates, cats and dogs

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Studying functions of the brain;
Legion studies (damaging parts of the brain)
Ablation studies (removing parts of the brain)
Testing the effects of antipsychotic drugs on the brain
Research into the effects of physical activity on the brain (e.g. it was found, through animal studies,
that more exercise improves the…

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These studies are also helpful to the species being studied as we learn more about how we
can improve their care

Ethical disadvantages;
Animals are likely to be confined more than they normally would (in the `wild') when they are
in a laboratory setting which is unethical because they are…

Page 7

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The brain contains billions of neurons which pass information around inside the brain and around the
body; telling different parts of the body what to do.
Neurons communicate with each other through synapses ­ passing neurotransmitters from the
terminal button of one, to the dendrite of the next.
Some synapses…

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