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Blood Flow Measures
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PET and fMRI

There are two main measurement technologies used in neuroscience that derive images of brain activity by measuring blood flow in the brain:

  • Positron Emission Tomography (PET)
  • Functional Magnetic Resonance Imaging (fMRI)

Both techniques provide indirect measures of brain activity because they rely on the assumption that mental activity increases demand for oxygen or glucose in regions in the brain that are activated, and that this need is met by increased blood flow to the region.


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