It uses radioactive substances ingested (harmless amounts) by willing participants to trace brain activity. The technique is based on features of brain metabolism: active areas are associated with increased blood flow and decaying radioactive substances can serve as a gauge where this blood flow is occurring. Detectors pick up this blood flow and convert it into visual imagery. The image is a map of the brain in which hot colors like red and yellow indicate increased activity while cool colors eg. Blue and green indicate less activity
Chatelaine answered the question on June 16, 2021 at 13:09
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June 16, 2021
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June 16, 2021
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June 16, 2021
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