In a study comparing the brain activity of a group of introverts with that of a group of extraverts, the research compares images of their brains to assess the level of a glucose (i.e., sugar-based) tracer substance in brain cells in response to the individuals being asked to imagine themselves starting a conversation with a total stranger at a party. The assessment technique used to measure the level of glucose tracer substance is called a(n):

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Positron emission tomography (PET) is a technique that measures the level of glucose tracer substances in the brain, providing images of brain activity.

In a Study Comparing the Brain Activity of a Group