EEG Headset with Active/Passive Electrodes

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This took me a while to get around to but I finally constructed an EEG headset for my neuro-feedback experiments. Took an old pair of headphones and converted it into my headset, using a pair of active electrodes I built (based on the concept and design shared at the OpenEEG project) as well as passive electrodes from olimex. The advantage of implementing active electrodes in this headset is that you do not have to apply any electrode gel, plus it’s useful because the gold-plated pin array helps to get past hair and maintain contact with the scalp at the back of your head (occipital region).

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The passive electrodes work fine as they are, coz they sit comfortably on the forehead just above the eyebrows (frontal ridge); again, no gel needed.

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If you choose to construct a headset like this with an active+passive electrode combo for each channel, then you will have to match the output signal levels between the electrodes in each set (i.e., between active and passive on the Left and then Right). The active electrodes are more sensitive to movement artifacts but they have better noise rejection since each active has the gain amplifier on board (I didnt have the time or inclination to experiment further, but I’m sure it will be much better if you construct active electrodes with SMD components).

If any of y’all construct a similar headset of your own, feel free to share your photos & comments!

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~ by teknomage on May 4, 2013.

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