The MEG scan is performed in a room that is shielded from magnetic or electrical activity. You will need to remove all metal jewelry or clothing. A technician will attach coils to your head with tape. Then the MEG machine fits over your head like a helmet. You may sit in a chair or lie down and can sleep during the scan, but you must be as still as possible throughout. It takes 30 minutes to over an hour to complete. The machine is quiet and records brain activity while you wait. Sometimes, the technician performing the scan may stimulate areas of the brain to get a more accurate map.