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" ... The selected patients underwent PET/CT scans (positron emission tomography/computed tomography) with a radioactive tracer called fluorodeoxyglucose, similar to the sugar glucose. With this kind of scan, physicians can see which cells are taking in glucose at higher rates, in other words which cells are using the most energy. The imaging method is commonly used to detect cancer, but these scans could also show brain activity. In this case, the authors were interested in activity in the amygdala, a brain area associated with stress, emotion and fear. Amygdalar activity is typically higher in people experiencing chronic stress compared to people not experiencing prolonged stress. ... "