Which of the following cannot be used as part of procedures to detect local brain activity in humans?  Assessment of deoxyglucose use   Assessment of blood flow   Positron emission tomography   Assessment of fluorodeoxyglucose use   Functional magnetic resonance imaging

All the options mentioned - Assessment of deoxyglucose use, Assessment of blood flow, Positron emission tomography, Assessment of fluorodeoxyglucose use, Functional magnetic resonance imaging - are actually used as part of procedures to detect local brain activity in humans.

1. Assessment of deoxyglucose use: This is a method used in PET scans. A radioactive glucose compound is injected into the bloodstream, which is then taken up by active brain cells. The radioactivity can be detected and used to create an image of brain activity.

2. Assessment of blood flow: This is the principle behind functional magnetic resonance imaging (fMRI). Active brain cells require more oxygen, so they increase blood flow to their area. The fMRI can detect these changes in blood flow and use them to create an image of brain activity.

3. Positron emission tomography (PET): This is a type of imaging test that helps reveal how your tissues and organs are functioning. A PET scan uses a radioactive drug (tracer) to show this activity.

4. Assessment of fluorodeoxyglucose use: This is a type of PET scan. Fluorodeoxyglucose is a radioactive compound that is taken up by active cells. Its radioactivity can be detected and used to create an image of brain activity.

5. Functional magnetic resonance imaging (fMRI): This is a technique for measuring and mapping brain activity that is noninvasive and safe for the patient. fMRI works by detecting changes in blood oxygenation and flow that occur in response to neural activity.

So, none of the options provided cannot be used as part of procedures to detect local brain activity in humans.