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n. Abbr. MEG
A diagnostic imaging technique that detects and records magnetic fields produced by electrical activity in the brain.

mag·ne′to·en·ceph′a·lo·graph′ic (-ə-lə-grăf′ĭk, -ə-lō-) adj.
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The researchers studied 14 women using a magnetoencephalograph - a machine that measures magnetic waves created by brain activity.
Growing importance of long-term monitoring and intra-operative monitoring is promoting growth in the NPM market, along with increased clinical diagnostic verification of magnetoencephalograph (MEG) monitoring equipment.
The sophisticated machine, known as a magnetoencephalograph, or MEG scanner, will be able to monitor where thought and speech functions take place in the brain.