It is also used to help diagnose sleep disorders, depth of anesthesia, coma, encephalopathies, cerebral hypoxia after cardiac arrest, and brain death. EEG can detect the onset and spatio-temporal evolution of seizures and the presence of status epilepticus. EEG can detect abnormal electrical discharges such as sharp waves, spikes or spike-and-wave complexes that are seen in people with epilepsy, thus it is often used to inform the medical diagnosis. Voltage fluctuations measured by the EEG bioamplifier and electrodes allow the evaluation of normal brain activity including the posterior dominant rhythm (PDR), first described by Hans Berger. Clinical interpretation of EEG recordings is most often performed by visual inspection of the tracing or quantitative EEG analysis. Electrocorticography, involving surgical placement of electrodes, is sometimes called " intracranial EEG". It is typically non-invasive, with the EEG electrodes placed along the scalp (commonly called "scalp EEG") using the International 10-20 system, or variations of it.
The biosignals detected by EEG have been shown to represent the postsynaptic potentials of pyramidal neurons in the neocortex and allocortex. Electroencephalography ( EEG) is a method to record an electrogram of the spontaneous electrical activity of the brain.
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