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Electrical current flow due to neuronal activity in the human brain gives rise to tiny (10-15 Tesla) magnetic field variations outside the head.
Magnetoencephalography (MEG) is the measurement of these magnetic fields and the subsequent estimation of the electrical changes in the brain activity that gave rise to these fields.
The technique has the potential to track changes in electrical activity across the cortex millisecond by millisecond and is completely non-invasive.
The MEG scanner at the FIL is the CTF 275 channel Omega system and supports a diverse body of research from across groups within the centre. The MEG imaging software developed by the methods group is distributed within the SPM package.