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A patient is fitted with an electroencephalography (EEG) cap at the Neuroimaging research center of Pitié Salpêtrière hospital, Paris, France. This allows the EEG to be combined with another test, Magnetoencephalography, or MEG. MEG detects variations in the brain's magnetic field during various types of cerebral activity. It studies normal and abnormal brain function. Recording the magnetic field produced by neuronal currents requires ultra sensitive sensors called SQUIDs (Superconducting Quantum Interference Device). The 306 sensors spread over 102 areas allow both near and far magnetic fields to be measured, and the brain's deep structures to be 'seen'.