There are two websites that can explain the pallidotomy procedure: If you have a scientific background, the following article is excellent in explaining the procedure: http://neurosurgery.mgh.harvard.edu/pallidt.htm If you prefer a more simplified version that is written for the layperson, then check at www.axonnet.com, www.axonet.com, or www.axon.net. I can't remember the exact URL. Teresa