Yeah, I've been very busy and haven't posted our results yet, so I might as well post preliminary ones here.

We had five people doing Dual N-Back; everyone did it for ~40 minutes to an hour in three sessions. The control group just did three sessions; the experimental group did a session, applied the electrodes, did a session, removed the electrodes, and then did a final session.

The control group showed minor improvement from session to session. Both experimental subjects showed a minor decline under current application which reversed after the current was removed. The other guy didn't notice much originally, I reported that I felt less interested in doing DNB under current, and found the data suggested my ability declined; he analyzed his data and agreed it was probably a negative effect.

Our equipment was poor, though. I'm pretty sure we should have used EEG electrodes, and instead used TENS electrodes (used for muscle stimulation) which are way bigger- which probably had some effect. We were working off a 10-20 diagram, but none of us are trained technicians for this sort of thing.

So, the takeaway for me was that this does have the power to change things, but getting that change to be positive is nontrivial. I'm planning on investing more in equipment (we can get proper electrodes and a placement cap for $70, whereas the electrodes I bought were around $4 a person) and repeating (with me, at least; I don't know how many other people are willing to shell that out). Once I do that, I'll write that up.

I think it's for shutting down the internal monologue for people who can't do it by will. If you can do it yourself, do you know if shutting down your internal monologue also cuts back on habitual muscle tension?