Which technique is likely to be most useful for identifying the activity of a specific neurotransmitter in the brain

Question

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Positron emission tomography (PET) is a technique that can be used to identify the activity of a specific neurotransmitter in the brain. It involves injecting a small amount of a radioactive substance that is attached to a specific neurotransmitter, which can then be tracked and monitored as it moves through the brain. By analyzing the spatial and temporal distribution of the radioactive tracer, researchers can gain insight into the activity of specific neurotransmitter systems in the brain.

Which Technique Is Likely to Be Most Useful for Identifying