Electroencephalography

Electroencephalography (EEG) is a method to record an electrogram of the spontaneous electrical activity of the brain. The bio signals detected by EEG have been shown to represent the postsynaptic potentials of pyramidal neurons in the neocortex and allocortex. It is typically non-invasive, with the EEG electrodes placed along the scalp using the International 10–20 system, or variations of it.

Electrocorticography, involving surgical placement of electrodes, is sometimes called "intracranial EEG".
EEG is widely used both as a clinical diagnostic tool, particularly in epilepsy, and as a research tool in neuroscience.
Clinical interpretation of EEG recordings is performed by visual inspection of the tracing, which is the standard method.

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