Edexcel A-Level Psychology 9PS0
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Biological Psychology
Brain-scanning techniques
- 3 things to know
- Papers 1 and 3
Overview
Recall questions on how CAT, PET and fMRI work, structure against function, radioactive tracers, temporal and spatial resolution, their use in investigating aggression, why they show only correlation, and the radiation risk of CAT scans.
What you need to know
Answer each one before you reveal it.
What is a key difference between PET and fMRI regarding the substances required for scanning?
How are the X-rays taken during a CAT scan to build up an image?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What type of radiation does a CAT scan use to create images of the brain?
Model answer
X-rays
- 2
How are the X-rays taken during a CAT scan to build up an image?
Model answer
X-rays are taken from multiple angles around the head
- 3
What type of image does a CAT scan produce?
Model answer
Cross-sectional images of the brain
- 4
Where does the radioactive tracer accumulate during a PET scan?
Model answer
In active brain areas (regions with higher metabolic activity)
- 5
What type of radiation does a PET scanner detect?
Model answer
Gamma rays emitted from the decay of the radioactive tracer
- 6
What does a PET scan measure about the brain?
Model answer
Metabolic activity in different brain regions
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