Most of the setups for passive electrodes I’ve seen use unshielded cables, and it appears likely that the longer the cable, the more prone to electromagnetic interference such as 50/60Hz mains it will be.
Does anyone have experience with shielding, particularly in the context of a OpenBCI EEG setup?
I’m thinking of using coaxial cables for electrodes or some kind of foil “hat”.
Either way, I’m uncertain if this would distort the signal by capacitance as well as which “ground” to connect it to. I’m guessing Reference or Bias, but I really don’t know.
The best I found on a search so far was this: Noise reduction strategies in electrophysiology but I’m having trouble interpreting it in practical / OpenBCI terms.
Any ideas or experiences on this?