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Product Detail
active dry electrode system
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active dry electrode system

Normally, the electroencephalogram (EEG) is recorded from the surface of the head with gel based electrodes to get a low electrode-skin impedance. If passive electrodes are used, the skin must be abraded beforehand to reduce the impedance. With active electrodes, which contain an amplifier inside, the electrode gel is injected between the electrode material and the skin. This allows the electrode system to be mounted more quickly.

One of the main advantages of gel based active electrodes is their robust signal quality, but the main disadvantages are the long montage time and the need to wash the cap and the user's hair after the recording. g.tec thus developed a dry electrode system that does not require electrode gel, as shown in Figure 1. The patented g.SAHARA electrode system consists of an 8 pin electrode made of a special golden alloy. The pins have sufficient length to reach through the hair to the skin. The golden alloy and the 8 pins reduce the electrode-skin impedance. The electrode itself can be connected with a clip to the active electrode system on top of it.

g.SAHARa active dry EEG electrode
Rear view of the g.SAHARAelectrode.
Figure 1: g.SAHARA dry active electrode systemFigure 2: 2nd generation of the g.GAMMAcap with highly optimized fit to the head and very narrow joints to maximize possible electrode locations.

EEG recordings are performed at frontal, central, parietal and occipital regions of the head, and therefore a mechanical system is required that holds the electrode on the skin with a constant pressure at every possible recording location. EEG electrodes are typically positioned according to the international 10/20 system. g.tec hence developed the 2nd generation of the g.GAMMAcap, with a total of 160 positions according to an extended 10/20 system, to allow a very flexible electrode montage, as shown in Figure 2.

Product Highlights

  • The first and only dry electrode system that works for all frontal, central, occipital, temporal and parietal sites

  • The first dry active electrode available on the market

  • Patented technology

  • The first and only dry system successfully tested with all major BCI approaches in group studies, reported in peer-reviewed papers

  • Cost range of an active EEG electrode

  • Captures the whole EEG frequency spectrum from 0.1-40 Hz

  • Perform EEG recordings without gel

  • Mount the cap in under one minute!

  • No more need to wash the hair or cap!

  • Able to pick up frequency spectra for P300, motor imagery and SSVEP based BCIs