Studying brain stimulation in people with impulse-control problems

Inclusion Criteria: 1. Age at the time of enrollment: ≤ 70 years 2. Diagnosis of PD according to MDS clinical diagnostic criteria 3. Onset of first PD motor symptoms ≥ 4 years 4. Moderate or severe impulse control disorder or related behavioral disorders according to Ardouin, with at least 1 score greater than or equal to 3 (or at least 2 scores greater than or equal to 2) on the Ardouin behaviour scale with the following items considered to reflect ICBDs or related behaviors: pathological gambling, hypersexuality, shopping, eating, hobbyism, punding and compulsive medication use 5. MDS-UPDRS III improvement of ≥ 30% in the standardized levodopa test or classical Parkinsonian tremor at rest 6. Adaptation of medical therapy has been attempted 7. MoCA ≥ 24 in the meds on condition 8. BDI-II score \< 20 in the meds on condition, or Patients with moderately severe depression with a BDI-II between 20 and 28 points, strict consideration must be made with the involvement of a psychiatrist. Patients must be willing and able to comply this. 9. Patients able to understand the study requirements and the treatment procedures 10. Written informed consent before any study-specific tests or procedures are performed Exclusion Criteria: 11. Surgical contraindications to undergo DBS operation 12. Ongoing severe depression (BDI-II \> 28) 13. suicidal ideation (item 9 of BDI-II \> 1) 14. Dementia (MoCA \< 24) in the meds on condition 15. Any prior movement disorder treatments that involved intracranial surgery/ablation or intracranial device implantation 16. Any other active implanted device that is likely to interfere with the implantation or functioning of the DBS system 17. Simultaneous participation in another clinical trial targeting or potentially interfering with ICD 18. Any history of recurrent seizures or haemorrhagic stroke 19. Fertile women not using adequate contraceptive methods 20. Any terminal illness with significantly reduced life expectancy which exclude DBS implantation according to standard clinical care 21. A female who is breastfeeding or of child-bearing potential with a positive urine pregnancy test or not using adequate contraception 22. Any impairment that would limit subject's ability to participate in the study and perform study procedures 23. Have any significant medical condition that is likely to interfere with study procedures or likely to confound evaluation of study endpoints