Low-cost open-source active electrode to measure EEG

One suggestion for innovation above and beyond current expensive equipment would be to make a dual-electrode sensor with the noise cancellation built-in. I worked in a research lab that pioneered this [1], essentially when you are wearing EEG you typically have to hold your head very still due to motion artifacts. So to permit gait/prosthetic studies, they came up with gluing electrodes back to back so that the outer one just faces upwards and collects the noise. However, this doubles the equipment costs, as well as requires MATLAB post-processing for noise removal. So an all-in-one unit would be very interesting to see.

[1] https://pubmed.ncbi.nlm.nih.gov/30074489/

Was anybody able to find the circuit schematics of this open-source design?

I’m super interested in BCI in general, but not convinced hobbyist (< $1000) equipment is useful enough to be worth the investment at this point.

Once a year or so I check in on Emotiv and OpenBCI and Neurosky and others, and so far nothing seems to hit the affordable + casually hackable spot that will make me pull the trigger.

So yeah I’m interested, but primarily in a turnkey solution from hardware to software libraries.