Detailed Instructions: In this task, you are given a passage which has a question and the context. You have to generate an answer to the question based on the information present in the context.
Q: Context: Subthalamic nucleus deep brain stimulation (STN0 DBS) is a widely performed surgical treatment in PD. However, the relationship between motor results and cognitive/behavioural modifications is unclear.', 'This study investigated the correlation patterns of the motor, cognitive and behavioural consequences of STN DBS with respect to positioning of the active contact.', 'Fifty-eight consecutive PD patients having undergone STN DBS were assessed pre-operatively and 12 months after surgery.', 'Motor, cognitive and behavioural results were neither correlated to each other nor linked to the position of the active contact. Three patients with a history of pre-operative, dopaminergic psychosis or post-surgical confusion became demented. Age and a distant history of depression were associated with the occurrence of post-surgical depression.\Question: Are stimulation of the subthalamic nucleus in Parkinson 's disease : cognitive and affective changes linked to the motor outcome?
A:
Correct screening of patients for STN DBS remains an important issue, since the current implantation procedure is not able to take account of potential functional heterogeneity within the target.