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electroencephalography
(e-lek″tro-әn-sef´ә-log´rә-fe)
the recording of changes in electric potentials in various areas of the brain by means of electrodes placed on the scalp, on the brain surface, or within the brain itself, and connected to a vacuum tube radio amplifier, which
amplifies the impulses more than a million times. The impulses are of sufficient magnitude to move an electromagnetic pen
that records the brain waves. adj., electroencephalograph´ic., adj.

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