For a study investigating whether different combinations ofbrain regions are activated by different emotions, researchers used positron emission tomography (PET) to scan participants'brains while they recalled emotionally charged memories to generate feelings of sadness, happiness, anger, and fear.

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The study did use PET to scan participants' brains while they recalled emotionally charged memories to generate feelings of sadness, happiness, anger, and fear.

For a Study Investigating Whether Different Combinations Ofbrain Regions Are