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Globus pallidus internus activity increases during voluntary movement in children with dystonia

Estefania Hernandez-Martin1, Maral Kasiri2, Sumiko Abe1

  • 1Department of Electrical Engineering and Computer Science, University of California, Irvine, Irvine, CA, USA.

Iscience
|June 30, 2023
PubMed

Insights

This study on dystonia found abnormal brain activity patterns, not reduced inhibition, in the basal ganglia. Findings suggest targeting globus pallidus interna (GPi) dysfunction may improve deep brain stimulation (DBS) outcomes.

Area of Science:

  • Neuroscience
  • Movement Disorders
  • Neurology

Background:

  • The rate model of basal ganglia function posits dystonia arises from thalamic disinhibition due to reduced pallidal input.
  • Dyskinetic cerebral palsy (DCP) offers a model to study dystonia mechanisms in children evaluated for deep brain stimulation (DBS).

Purpose of the Study:

  • To test the hypothesis that dystonia involves thalamic disinhibition caused by decreased pallidal input.
  • To analyze movement-related neural activity and connectivity in basal ganglia and thalamic regions in children with DCP.

Main Methods:

  • Investigated movement-related activity in the globus pallidus interna (GPi), thalamus (VoaVop), and subthalamic nucleus (STN) using DBS evaluation data.
  • Performed connectivity analysis to assess neural coupling between STN, VoaVop, and GPi.

Main Results:

  • Observed prominent beta-band frequency peaks in GPi, VoaVop, and STN during movement, but not at rest.
  • Connectivity analysis revealed stronger STN-VoaVop and STN-GPi coupling than GPi-STN coupling.
  • Findings contradict the reduced thalamic inhibition hypothesis.

Conclusions:

  • Dystonia likely involves complex abnormal inhibition/disinhibition patterns, not solely reduced GPi activity.
  • Abnormalities in GPi function are implicated in dystonia.
  • DBS effectiveness targeting STN and GPi may stem from correcting GPi dysfunction.

Keywords:
NeurologyNeurosciencePathophysiology

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