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Electroencephalography (EEG) [1] is a method to record an electrogram of the spontaneous electrical activity of the brain.The biosignals detected by EEG have been shown to represent the postsynaptic potentials of pyramidal neurons in the neocortex and allocortex. [2]
While electrophysiological tests generally passively collect electrical data, it is sometimes necessary to apply an external stimulus to the desired target in order to produce transient evoked potentials that can provide further insight not obtained from solely passive recording methods.
The temporal lobe epileptiform discharge is a pattern seen on the electroencephalgram (EEG) test; temporal lobe epileptiform discharges occur between seizures and confirm the diagnosis of temporal lobe epilepsy. [3] Long-term video-EEG monitoring may record the behavior and EEG during a seizure. [3]
Electroencephalogram (EEG) is also used to detect abnormal brain waves and activity that is reflected as slow waves, or spikes on the recordings. For occipital epilepsy, commonly identified abnormalities on the EEG when a seizure is not occurring (inter-ictal) includes posterior lateralized slow waves, asymmetrical alpha and photic following ...
If it was an unprovoked seizure with abnormal brain imaging or abnormal EEG, then it is recommended to start anti-seizure medication. [3] If a person has an unprovoked seizure, but physical exam is normal, EEG is normal, and brain imaging is normal, then anti-seizure medication may not be needed. [3]
An epilepsy syndrome is defined as "a characteristic cluster of clinical and Electroencephalography (EEG) features, often supported by specific etiological findings (structural, genetic, metabolic, immune, and infectious)." [1] Syndromes are characterized by seizure types and specific findings on EEGs. Epilepsy syndromes often begin, and may ...
"a method of quantitative EEG that provides a precise, reproducible estimate of the deviation of an individual record from normal. This computer analysis makes it possible to detect and quantify abnormal brain organization, to give a quantitative definition of the severity of brain disease, and to identify subgroups of pathophysiological ...
Furthermore, as noted, abnormal EEG readings in people with TEA occur primarily in sleep EEG. However, the "reason for the close relationship of TEA with sleep is unclear. It may be that the transition from sleep to waking acts as a trigger to a seizure focus in the medial temporal lobe.