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Building 149 is home to the Center's magnetoencephalography (MEG) facilities, which are used for clinical as well as research purposes. As with electroencephalography (EEG), the principal sources of MEG are synchronous synaptic currents in the cerebral cortex. Under special circumstances, activity in the cerebellum as well as in certain subcortical structures can be detected as well. MEG and EEG provide an instantaneous view of neural activity and thus are complementary to functional MRI.