The 10–20 System

Much can be learned about the brain by measuring the electric potential on the scalp surface. Such data are called the electroencephalogram (EEG)… Typically, the EEG is measured from 21 electrodes attached to the scalp according to the 10–20 system (Fig. 7.34).

Fig. 7.34. The standard 10–20 system of electrodes to record the EEG.
Measurement of the 10–20 system of electrodes (part 1).
Measurement of the 10–20 system of electrodes (part 2).

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