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Electroencephalograms (EEGs) are tracings of amplified electrical activity of the brain recorded over time on multiple channels and with varied lead-patterns ("montages") by means of electrodes applied to the scalp. Great care and experience are required to record properly and interpret accurately these tiny potentials elaborated by cortical neurones. Its relation to the electrocardiogram (ECG) is as chess is to tic-tac-toe. "The EEG . . . reflects normal organized cellular activity within the brain and indicates how it is modified by disease" (p. 421).
The EEG remains a primary mode of laboratory assessment in neurology—despite advances such as computerized axial
Current Practice of Clinical Electroencephalography.. Ann Intern Med. ;92:582–583. doi: 10.7326/0003-4819-92-4-582_3
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Published: Ann Intern Med. 1980;92(4):582-583.
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