Does focusing on a certain part of the body increase electrical activity in that region?
Gut reaction, I don't think this is a solid thesis idea. If you attach an EMG to my finger, and then I concentrate on my finger, and then my finger moves (due to stray thoughts), there will of course be a whole bunch of action potentials firing. However, that's kind of trivial and not really that interesting.

If your theme is "weird EM effects in the human body", one possible decent idea (and one that's gotten some quantity of buzz in the recent past) would be to focus on the role of electric fields in wound healing. You could even add in an intentionality/focus angle, if you really wanted to.