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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.
For example, scientists can measure the brain and heart's magnetic fields with instruments called the magnetoencephalograph and magnetocardiogram, respectively.
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.