The last test before my lobeectomy was a SEEG surgery. (I had 11 electrodes 3"+ long shoved directly into my grey and white matter) The last part of the test is stimulation. They're applying stimulation at different voltages, amperage and frequencies to very specifically triangulated ares to be sure there aren't any cognitive, motor neural or autonomous functions in the parts they want to resect. I had to describe what I was seeing, feeling or hearing for each stimulation. It was absolutely bizarre. For instance, during one of the settings I had no muscle tone and struggled to lift my arm to point at the TV, another I had an increasing frequency sweep from one ear to the other. It was neat-o.