Source:http://linkedlifedata.com/resource/umls/id/C0180635
UMD: Electrodes designed to be placed on a patient's scalp (and in some cases, other anatomic locations) to measure, amplify, display in graphic form, and record the weak electrical signals generated by the brain. Electroencephalography is useful in observing and diagnosing a variety of neurologic conditions, including epilepsy, related convulsive disorders, and brain death. It can also be used to evaluate psychiatric disorders and differentiate among various psychiatric and neurologic conditions. In addition, electroencephalographic studies can assist in localizing tumors or lesions on or near the surface of the brain. There are also electroencephalography electrodes designed to be placed in specific anatomic locations, such as the nasopharyngeal cavity (see "Electrodes, Nasopharyngeal").