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STN stimulation alters pallidal-frontal coupling during response selection under competition.

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Bilateral subthalamic nucleus (STN) stimulation impaired random number generation in Parkinson's patients. STN stimulation reduced frontal brain activity and increased pallidal activation, altering cortico-pallidal connectivity.

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Area of Science:

  • Neuroscience
  • Neurology
  • Neurosurgery

Background:

  • Parkinson's disease (PD) affects motor control and cognitive functions.
  • Subthalamic nucleus (STN) deep brain stimulation (DBS) is a common PD treatment.
  • Cognitive tasks like random number generation (RNG) assess executive functions.

Purpose of the Study:

  • To investigate the impact of bilateral STN DBS on brain activation during RNG.
  • To examine how STN DBS affects cognitive control and response selection.
  • To understand the neural mechanisms underlying STN DBS effects on executive function.

Main Methods:

  • H(2)(15)O positron emission tomography (PET) to measure regional cerebral blood flow (rCBF).
  • Six Parkinson's disease patients undergoing bilateral STN DBS.
  • Comparison of paced RNG (1 Hz) with a control counting task, with DBS on and off, off medication.

Main Results:

  • STN DBS worsened RNG performance, reducing randomness and increasing habitual counting.
  • STN DBS decreased rCBF in prefrontal and cingulate cortices.
  • STN DBS increased rCBF in the right internal globus pallidus (GPi) and altered pallidal connectivity.

Conclusions:

  • STN DBS activates STN output neurons projecting to the GPi.
  • STN DBS leads to increased inhibition of a prefrontal-cingulate network.
  • This study provides direct evidence of STN DBS altering cortico-pallidal coupling during cognitive tasks.