it is hard to say...anecdotally, I've seen generally that the further the electrode is located away from the posterior subthalamic nucleus, the higher the PW is

it is hard to say...anecdotally, I've seen generally that the further the electrode is located away from the posterior subthalamic nucleus, the higher the PW is needed to achieve any effect. Maybe the electrode probably needs it to send current over further distances. But it may be helpful to map things out if imaging is available. Targeting has probably come a long way too. I remember pulling old MRI's from cases done in 2003 or so, and they just look so fuzzy and crude compared with modern machines...