Pretty cool video. They're testing to see for a reduction in tremor with minimal side-effects at a couple different voltages to make sure they have the electrodes at the right spot. It would have been cool to see him play without the stimulator turned on, too.
I didn't hear much booing. Sounded like lots of cheers and whoops and clapping. We are totally fucked!! Also, oweff, there is a McCain/Palin 2008 ad at the bottom of this page. Do you have any idea how this might affect you in the next life?