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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.

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Key term

Why can fMRI distinguish between active and inactive brain regions based on blood flow?

Key term

What is a key difference between PET and fMRI regarding the substances required for scanning?

Key term

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. 1

    What type of radiation does a CAT scan use to create images of the brain?

    Model answer

    X-rays

  2. 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. 3

    What type of image does a CAT scan produce?

    Model answer

    Cross-sectional images of the brain

  4. 4

    Where does the radioactive tracer accumulate during a PET scan?

    Model answer

    In active brain areas (regions with higher metabolic activity)

  5. 5

    What type of radiation does a PET scanner detect?

    Model answer

    Gamma rays emitted from the decay of the radioactive tracer

  6. 6

    What does a PET scan measure about the brain?

    Model answer

    Metabolic activity in different brain regions

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