>> electrodes are placed in the hypothalamus into the center that makes you feel full.he other part is your appetite center where your drive to eating is. these electrodes have contacts on them that go through these areas and a pacemaker type generator is inserted under the skin and from that we're able to change the settings and try to see if we can affect the appetite drive these patients have. >> larry: what have you learned so far? >> we have learned in the first series we have done that the procedure can be done safely, we have learned that we don't think we're having side effects and that we can affect the urge to eat, decrease the urge, we're looking at it being well tolerated. but the real -- the jury's still out where we don't have all the results yet, we're now working on trying to refine the settings to see if we can get the weight loss that we and the patients desire why only very obese people? >> patients who have failed all medical diets, patients who have failed gastric or bypass surgery. and again their life expectancy is significantly reduced if they ca