Table 1 Brain Imaging Techniques for Mapping Brain Function Technique Contrast Mechanism Functional MRI (fMRI) Blood deoxyhemogloblin levels Positron Emission Tomography (PET) -- Intracellular glucose FDG/O15 uptake/blood flow Electroencephalography (EEG) Electrical/magnetic signal Magnetoencephalography (MEG) during neuronal firing Functional MR spectroscopy (
fMRSI) -- Lactate production and lactate clearance during glycolysis/ neuronal activation