page_title: Magnetoencephalography
section_title: Magnetic shielding
hierarchical_section_title: Magnetoencephalography / Magnetic shielding
caption_attribution_description: English: Entrance to Magnetically Shielded Room (MSR), showing the separate shielding layers. See Magnetoencephalography
context_page_description: Magnetoencephalography is a functional neuroimaging technique for mapping brain activity by recording magnetic fields produced by electrical currents occurring naturally in the brain, using very sensitive magnetometers. Arrays of SQUIDs are currently the most common magnetometer, while the SERF magnetometer is being investigated for future machines. Applications of MEG include basic research into perceptual and cognitive brain processes, localizing regions affected by pathology before surgical removal, determining the function of various parts of the brain, and neurofeedback. This can be applied in a clinical setting to find locations of abnormalities as well as in an experimental setting to simply measure brain activity.
context_section_description: Since the magnetic signals emitted by the brain are on the order of a few femtoteslas, shielding from external magnetic signals, including the Earth's magnetic field, is necessary. Appropriate magnetic shielding can be obtained by constructing rooms made of aluminium and mu-metal for reducing high-frequency and low-frequency noise, respectively.
caption: Entrance to MSR, showing the separate shielding layers
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