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The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...
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Subthalamic Nucleus Deep Brain Stimulation Modulates 2 Distinct Neurocircuits.

Lunhao Shen1,2,3, Changqing Jiang1, Catherine S Hubbard3

  • 1National Engineering Laboratory for Neuromodulation, School of Aerospace Engineering, Tsinghua University, Beijing, China.

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Deep brain stimulation (DBS) for Parkinson disease reveals two distinct brain circuits. One circuit activates with high-frequency stimulation and improves motor function, while another deactivates over time and reduces bradykinesia.

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Area of Science:

  • Neuroscience
  • Neuromodulation
  • Medical Imaging

Background:

  • Deep brain stimulation (DBS) is a therapeutic intervention for Parkinson disease.
  • Understanding the whole-brain neuromodulatory effects of DBS is limited by current technological capabilities.

Purpose of the Study:

  • To investigate the whole-brain effects of subthalamic nucleus (STN) stimulation using a novel MRI-compatible stimulator.
  • To reveal DBS-induced activity at the whole-brain level in Parkinson disease patients.

Main Methods:

  • Utilized a 3T MRI-compatible stimulator for functional MRI (fMRI) in 14 Parkinson disease patients undergoing STN-DBS.
  • Acquired fMRI data during ON/OFF stimulation blocks at multiple time points (1, 3, 6, 12 months post-surgery) and presurgical resting-state fMRI.

Main Results:

  • Identified two distinct neurocircuits with differential responses to STN-DBS: an activated globus pallidus internus (GPi) circuit and a deactivated primary motor cortex (M1) circuit.
  • The GPi circuit showed frequency-dependent activation (high-frequency) and correlated with overall motor improvement.
  • The M1 circuit exhibited time-dependent deactivation and was associated with reduced bradykinesia.

Conclusions:

  • Concurrent DBS-fMRI successfully identified two distinct brain circuits responding differentially to STN-DBS.
  • These findings offer novel insights into the neural mechanisms of DBS and its symptom-specific effects in Parkinson disease.