Patients undergoing Deep Brain Stimulation for Parkinson's disease will be subjected to standard of care programming and compared with the algorithm based programming (StimSearch). Various parameters including the effectivity and efficiency of algorithm programming will be compared against the standard of care programming.

Patients of Parkinson's disease undergoing bilateral subthalamic nucleus stimulation (STN), we have already been adequately programmed and have achieved good outcome, will undergo an exploratory study to evaluate the effectiveness of algorithm based programming (Phase 1). Subsequently, patients undergoing STN DBS will be randomly allocated to algorithm based programming/ standard of care programming and after adequate stabilisation evaluated for motor improvement. They will be switched over to the alternative technique of programming and evaluated again after a similar period. Data regarding the time consumed, effectivity and several secondary endpoints will be evaluated.

Inclusion Criteria:

• Have a confirmed diagnosis of bilateral idiopathic Parkinson's disease
• Exhibit a UPDRS subset III score of ≥ 25 while in the preoperative medication off state
• Demonstrate an improvement of Parkinson's disease symptoms by ≥30% in the medication off state following a pre-operative levodopa challenge, as assessed by the UPDRS subset III score
• Possess the ability to comprehend the study's demands, treatment protocols, and procedures, and provide written informed consent before undergoing any study-specific tests or procedures

Exclusion Criteria:

• Patients with notable psychiatric conditions, including unrelated clinically substantial depression as assessed by the investigator, will be excluded from participation.