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1.  Pathological gambling after bilateral subthalamic nucleus stimulation in Parkinson disease 
We describe a patient with advanced Parkinson's disease who developed pathological gambling within a month after successful bilateral subthalamic nucleus (STN) stimulation. There was no history of gambling. On neuropsychological testing, slight cognitive decline was evident 1 year after surgery. Stimulation of the most dorsal contact with and without medication induced worse performances on decision making tests compared with the more ventral contact. Pathological gambling disappeared after discontinuation of pergolide and changing the stimulation parameters. Pathological gambling does not seem to be associated with decision making but appears to be related to a combination of bilateral STN stimulation and treatment with dopamine agonists.
doi:10.1136/jnnp.2006.102061
PMCID: PMC2117849  PMID: 17210626
2.  Does chronic subthalamic nucleus stimulation in advanced Parkinson's disease cause invalidating cognitive and behavioural dysfunctions? 
Cognitive and behavioural dysfunctions in patients with Parkinson's disease
doi:10.1136/jnnp.2006.097485
PMCID: PMC2117650  PMID: 17308286

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