TY - CHAP M1 - Book, Section TI - Electroencephalography A1 - Shih, Tina A2 - Brust, John C.M. Y1 - 2019 N1 - T2 - CURRENT Diagnosis & Treatment: Neurology, 3e AB - Electroencephalography (EEG), a diagnostic test invented over a century ago, is still widely used today in the evaluation of patients with paroxysmal neurologic disorders such as seizures and epilepsy. Although brain electrical activity is very low in voltage (on the order of microvolts) in comparison with ambient noise (on the order of volts), EEG uses the technique of differential amplification to cancel out noise and increase the amplitude of the waveforms of interest. EEG compares the voltages recorded from two different brain regions and plots this result over time. A standard array of metal electrodes is placed on the scalp of the patient, and over a 30-minute period, brain electrical activity sampled from different regions of the cortex is recorded simultaneously. EEG thus provides both spatial and temporal information about brain activity. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - neurology.mhmedical.com/content.aspx?aid=1159966963 ER -