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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