My colleague Maud Pélissier and I are currently setting-up a simplified, 1-channel wearable EEG system for our linguistic experiments. We want to use it in more realistic contexts outside the lab and for demos in class.

How does it compare to professional gear?

With 1 electrode in the occipital region, eyes closed, we get very decent alpha waves (band-pass filtered):

Although it is not directly comparable partly because of our imperfect ad-hoc post-sync method, here is the signal recorded at the same location with our pro-grade system with an estimated lag of -300 to 300 ms re the EEGino Pi signal.

Time-frequency representation for the EEGino Pi:

Corresponding time-frequency plot for the pro EEG:

From this rather informal visual test, it seems that our prototype is a good substitute for a professional EEG system in cases where spatial resolution and bit depth are not critical.