Electroencephalography (EEG) is an electrophysiological monitoring method to record electrical activity of the brain. In clinical contexts, EEG refers to the recording of the brain's spontaneous electrical activity over a period of time, as recorded from multiple electrodes placed on the scalp. Diagnostic applications generally focus on the spectral content of EEG, that is, the type of neural oscillations (as known as "brain waves") that can be observed in EEG signals. However, many EEG techniques used in research are not standardized sufficiently for clinical use.
