Hi, I had that test and swore to the doctor, if I ever had to take it again, I promise I will tell him anything he wants to know. The reason I had it was to determin if I had Myasthenia Gravis. The electrode needles were inserted into my muscle in my arm in 2 places and then in my forehead above my left eye. Once they are inserted they receive electrical shocks , to see how the nerve reacts, I guess, but then the needle is moved around in the muscle while still inserted! I had an hour of this but I must say I was happy to hear that I do not have that problem along with PD. Think happy thoughts Elizabeth 67/1 yr