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Hold your horses: impulsivity, deep brain stimulation, and medication in parkinsonism.

Deep brain stimulation (DBS) of the subthalamic nucleus markedly improves the motor symptoms of Parkinson's disease, but causes cognitive side effects such as impulsivity. We showed that DBS selectively interferes with the normal ability to slow down when faced with decision conflict. While on DBS, patients actually sped up their decisions under high-conflict conditions. This form of impulsivity was not affected by dopaminergic medication status. Instead, medication impaired patients' ability to learn from negative decision outcomes. These findings implicate independent mechanisms leading to impulsivity in treated Parkinson's patients and were predicted by a single neurocomputational model of the basal ganglia.

Pubmed ID: 17962524


  • Frank MJ
  • Samanta J
  • Moustafa AA
  • Sherman SJ


Science (New York, N.Y.)

Publication Data

November 23, 2007

Associated Grants


Mesh Terms

  • Aged
  • Antiparkinson Agents
  • Basal Ganglia
  • Conflict (Psychology)
  • Decision Making
  • Deep Brain Stimulation
  • Dopamine Agents
  • Female
  • Humans
  • Impulsive Behavior
  • Learning
  • Levodopa
  • Male
  • Middle Aged
  • Models, Neurological
  • Neural Networks (Computer)
  • Parkinson Disease
  • Reaction Time
  • Reinforcement (Psychology)
  • Subthalamic Nucleus