Electroencephalogram (EEG)

Research output: Chapter in Book/Report/Conference proceedingChapter


An electroencephalogram (EEG) is a recording from the scalp of the spontaneous electrical activity of the brain. It provides valuable insight into the brain function. It is most helpful in evaluating a patient suspected of having epileptic seizures. An EEG shows specific ictal discharges during an actual epileptic seizure and also discloses characteristic epileptiform findings in the interictal period (between seizures) in a high proportion of epileptic patients. It demonstrates focal and diffuse abnormalities associated with focal and diffuse encephalopathic conditions. It is a valuable test in patients with altered mental status, and infants with episodic motor or behavioral symptomatology. Because the severity of EEG abnormalities correlates with the severity of underlying brain dysfunction, the EEG is a valuable tool in providing prognosis.

Original languageEnglish (US)
Title of host publicationEncyclopedia of the Neurological Sciences
PublisherElsevier Inc.
Number of pages8
ISBN (Electronic)9780123851574
ISBN (Print)9780123851581
StatePublished - Jan 1 2014


  • Encephalopathy
  • Epilepsy
  • Epileptiform discharges
  • Nonconvulsive status epilepticus
  • Periodic lateralized epileptiform discharges (PLEDs)
  • Polymorphic δ activity
  • Triphasic waves
  • α Rhythm
  • β Activity

ASJC Scopus subject areas

  • Medicine(all)

Fingerprint Dive into the research topics of 'Electroencephalogram (EEG)'. Together they form a unique fingerprint.

  • Cite this

    Markand, O. N. (2014). Electroencephalogram (EEG). In Encyclopedia of the Neurological Sciences (pp. 1084-1091). Elsevier Inc.. https://doi.org/10.1016/B978-0-12-385157-4.00523-6