Deep-Brain Stimulation Protocol After surgery, a random sequence of contact activations (0 [Nacc],1,2 and 3), including sham (-), was generated for each patient. Each contact was activated using 130 Hz, 60 ms, and 4.5 V for three months (the sham activation was 0 V) following the patient's individual sequence, separated by one month of washout with the generator turned off