Immediately after the operation, the patient's condition improves (tremor, rigidity, etc.). This is due to the so–called penetration effect (a temporary swelling of tissues is formed at the site of electrode implantation, which creates the effect of stimulation switched on, thus reducing the severity of the symptoms of the disease). This effect gradually subsides (on average in 2–4 weeks). Approximately one month after the operation, the patient comes to the doctors, where the pulse generator is switched on for the first time and set up. The doctor will perform the initial adjustment, but many patients require several adjustment sessions, usually a few weeks apart, to achieve the best symptom control. The implant settings are then adjusted every few months thereafter.