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Cognitive impairment is common in Parkinson's disease. A recent study demonstrated 40% of people with PD suffer from mild cognitive impairment and \> 80% of patients develop dementia after a disease duration of 20 years. Cognitive impairment significantly impairs quality of life and has limited treatment options. While the pathophysiology of cognitive symptoms in PD is multifactorial, one contributing factor is dysfunction in subthalamic-cortical loops. The subthalamic nucleus (STN) receives input from distributed regions of the cortex, forming partially segregated parallel networks with sensorimotor regions, associative (cognitive) cortical regions, and limbic cortical regions. These subthalamic-cortical networks are thought to play a domain general role in inhibitory control, which is a fundamental mechanism underlying flexible behavior across motor, cognitive, and affective domains.
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