The subject was seated in a sound-attenuated chamber and instructed to focus attention on the center of a computer screen. She wore a fitted electrode cap (Electro-Cap International, Eaton, OH) containing 21 leads arranged in the montage of the International 10–20 System. The reference electrode was placed on the tip of the nose. A forehead electrode served as ground. Vertical and horizontal eye movements were monitored using electrodes situated above and below the left eye.
