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MEG

Magnetoencephalography (MEG) works by detecting the magnetic fields created by the brain's electric signals. These fields are a billion times smaller than the Earth's magnetic field, so MEG has to be carried out in a heavily shielded room - often in the dead of night, when other electrical devices are switched off. The person sits inside a 'helmet' of special sensors that detect the tiny magnetic signals produced by the brain.

An MEG scanner.
An MEG scanner.
CTF Systems Inc

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