Roger Frisch played the violin as doctors performed brain surgery on him. Roger Frisch got surgery for his essential tremors, a condition where the http://www.sodahead.com/united-states/roger-frisch-plays-violin-during-brain-surgery-should-we-operate-on-the-depressed-too/question-949222/ brain sends irregular signals to the muscles. The condition almost cost the concert master his career. As Frisch played notes, doctors were able to sync electrodes that were implanted into his brain. As the implant emit a low degree of electrical pulses, erroneous signals caused by essential tremors are canceled out.
