| You're completely right on so many levels. We're not hobbyist level, I'm the co-founder of https://affectablesleep.com, so consumer grade sleep eeg, but the main point is to increase the brain's restorative function, not just measure sleep, your watch/ring is good enough for that. We spent a LOT of time designing our dry electrodes, which work well, but in our final hardware, we've still decided to go with active electrodes (amplified signal, for those not familiar). You definitely need an RLD as well. The ability to move a mouse with just occipital electrodes and ref and rld has been done quite a bit, and there are projects such as this (https://openelectronicslab.github.io/eeg-mouse/) which show how it's done, as well as many published research papers. However, that isn't to suggest it's easy. As you've said, movement noise is a significant challenge. You'll need to be very still or else the electrode movement just causes a ton of noise. Your noise level comes less from the board than the electrode set-up. You mention [2] that does impedance measurement as well, but no link, can you post that? |