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By Nick Heath, 13 October 2008 17:11

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The MEG scanner is so sensitive it has to be screened by a Faraday cage, a mesh of copper, to block out interference.

This blue and green graph shows the electromagnetic field (EMF) readings in the MEG. The sharp spikes seen in the readout were caused by somebody merely tapping their foot on the floor in the next room, setting off minute vibrations in the under-floor metal beams.

Researchers filter out interference from other parts of the body such as from the heart beating by focusing on fields in a certain frequency.

Photo credit: Nick Heath/silicon.com