Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 23

electroencephalography - Clinical use, Research use, Methods, Activity types, Artifacts, History

sleep appears rhythm electrical

The investigation of the electrical activity of the brain, using electrodes applied to the scalp, and usually recorded as a tracing on paper (an electroencephalogram, or EEG). The EEG changes with the mental activity of the subject, and characteristic patterns of electrical activity (eg for sleep, coma, epileptic seizure) can be recognized. The alpha rhythm (c.10 Hz) appears with relaxation and eye closure. The delta rhythm (1–4 Hz) appears in deep sleep.

User Comments

Your email address will be altered so spam harvesting bots can't read it easily.
Hide my email completely instead?

Cancel or