Cerebral bloodflow

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Cerebral Blood Flow (CBF)
- Electroencephalogram (EEG)
  - Involves electrodes on scalp
  - Strengths
    - Good temporal resolution
  - Weaknesses
    - Poor spatial resolution (not due to number of electrodes but brain waves are spread out and chaotic, can add and cancel out.
    - Difficult to interpret
- Positron Emission Tomography (PET)
  - Inject radioactive tracers in blood and observe where they end up
    - Radioactive water stays in brain - more radioactivity = more flow
  - Raichle et al (1986, 1988) used PET to measure CBF
We can measure neural activity via electrodes in the brain, but can't use in human brains - if we could we would only get a small sample of neurons
Strengths
- Gives measurements in absolute units
Weaknesses
- Poor spatial and temporal resolution
- Radioactivity means same ppts. can't be tested too much

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