Interesting. There are three products I found on the market made for this, but one is unavailable to consumers, the other has temporarily ceased production, and

Interesting. There are three products I found on the market made for this, but one is unavailable to consumers, the other has temporarily ceased production, and the third I have but have not been able to get working. I’m trying some electrode gel on the one I have. If that doesn’t work, I’ll look into the sensor you linked. The process you described is exactly what these devices do: biofeedback.