
WaveRider Operating Manual
23
Copyright 1997-2004 Jonathan Purcell
All Rights Reserved
Electrode Placement
There is a standard pattern for placing electrodes on the scalp for the measurement of
brainwaves. This is known as the 10-20 system. Each electrode site has a name composed of
a letter and a sub-script. Each letter (with the exception of C which stands for center) refers to
the cerebral lobe over which the electrode is placed, i.e. T=temporal, P=parietal, O=occipital,
F= frontal, Fp=pre-frontal. The odd-numbered subscripts are on the left side of the head, the
even numbered sub-scripts are on the right. The subscript z is on the center line. Generally an
active electrode is placed on one ear lobe and a reference electrode on the other earlobe.
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