To Study the Brain, a Doctor Puts Himself Under the Knife

Brain-implanted electrodes provide detailed neural information that can drive brain-computer interfaces that are orders of magnitude faster and more accurate than EEG-based technologies.  However, the process of implanting electrodes is highly invasive, and research in this area has suffered from lack of participants.  In order to overcome this critical barrier, Phil Kennedy implanted electrodes into his own brain and conducted experiments on himself.

http://www.technologyreview.com/news/543246/to-study-the-brain-a-doctor-puts-himself-under-the-knife/