Is skin preparation necessary when using BioSemi active electrodes ?
ActiveTwo system is the only commercially available system with active
electrodes (first amplifier stage on the electrode), the use of active
electrodes eliminates 50 Hz interference pickup by the electrode wires,
even when the electrode impedance is high (in the 100 kOhm range), for
background theory see http://www.biosemi.com/publications/artikel3.htm.
Because high electrode impedances are tolerated, the
The preparations for an EEG measurement are very simple. Put on the headcap, fill the electrode holders with Signa gel and push the Active electrodes in the electrode holders. Excellent quality signals are immediately available. The whole procedure takes less than 20 minutes for a 128 channel headcap. The electrode contact can be continuously checked by the offset values in the BioSemi acquisition software.