EEG (electroencephalogram) - Mayo Clinic
https://www.mayoclinic.org/tests-procedures/eeg/about/pac-20393875
WEBMay 11, 2022 · An electroencephalogram (EEG) is a test that measures electrical activity in the brain using small, metal discs (electrodes) attached to the scalp. Brain cells communicate via electrical impulses and are active all the time, even during asleep. This activity shows up as wavy lines on an EEG recording.
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