ABSTRACT
Electroencephalograms (EEGs) are recordings of the minute electrical potentials produced by the brain. Since 1924, when Hans Berger reported the recording of rhythmic electrical activity from the human scalp, analysis of EEG activity has been conducted primarily in clinical settings to detect gross pathologies and epilepsies and in research facilities to quantify the central eects of new pharmacologic agents. Scalp recordings of spontaneous neuronal activity in the brain, identied as the EEG, allow the measurement of potential changes over time between a signal electrode and a reference electrode. Dierent types of recording instruments obtain a temporary or permanent record of the EEG. In general, the EEG contains information regarding changes in the electrical potential of the brain obtained from a given set of recording electrodes. In early attempts to correlate the EEG with behavior, analog frequency analyzers were used to examine single channels of EEG data.
