MEG uses supercooled detectors (SQUID—supercon-ducing quantum interface device) to measure the extremely weak magnetic fields produced by the electrical activity in the brain that results from neurons firing. MEG can localize the source of these fields and provide functional images showing these sources as they change from one task or state to another. As an adjunct to EEG and EP mapping, MEG gets below the cortical surface and can map the entire brain, although best results come from cortical areas. Like fMRI, MEG results are typically coregistered on structural MRIs. Currently, MEG is limited to only a few centers worldwide; it is expensive and difficult to use. Hari and colleagues have published extensively on MEG and sensory activations.

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