The operation, long used to calm the tremors associated with illnesses such as Parkinson???s disease, is always done while fully conscious.His surgeon, Dr. Nader Pouratian, director of UCLA???s Neurosurgical Movement Disorders Program, had felt confident that Carter???s symptoms would be alleviated. ???About 80 to 90 percent of people will have, on average, a 50 percent reduction in their tremor w