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    • Measures electrical activity in the brain

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      • An electroencephalogram (EEG) is a test that measures electrical activity in the brain. This test also is called an EEG. The test uses small, metal discs called electrodes that attach to the scalp. Brain cells communicate via electrical impulses, and this activity shows up as wavy lines on an EEG recording.
      www.mayoclinic.org/tests-procedures/eeg/about/pac-20393875
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  8. Electroencephalogram (EEG) Neurology Diagnosis and Screening for Neurological Conditions. What is an EEG? An EEG is a test that detects abnormalities in your brain waves, or in the electrical activity of your brain. During an EEG, electrodes are pasted onto your scalp. These are small metal disks with thin wires.