Jud Brewer's fMRI research at Yale found the PCC to be a major area of interest in terms of mindfulness and no-self. At UMASS he is apparently experimenting to see if EEG biofeedback could do something similar to the PCC biofeedback he did with fMRI. EEG biofeedback would be far more accessible.
As Brewer recalls, “Some of our novice subjects were able to make their PCCs look like those of advanced meditators after only nine minutes of real-time neurofeedback. They would get out of the scanner and ask how soon they could come back and do it again. I wish I had that ten years ago when I was striving my butt off trying to learn to meditate.”