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Subthalamic Nucleus Activity during Cognitive Load and Gait Dysfunction in Parkinson's Disease.

Matthew J Georgiades1,2, James M Shine1,2, Moran Gilat1,3

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Cognitive load can trigger Parkinson's disease gait freezing. Reduced theta frequency firing in the subthalamic nucleus during dual-tasking suggests a neurobiological link, informing adaptive deep brain stimulation.

Keywords:
Parkinson's diseasedeep brain stimulationfreezing of gaitsubthalamic nucleusvirtual reality

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Area of Science:

  • Neuroscience
  • Movement Disorders
  • Biomedical Engineering

Background:

  • Gait freezing is a disabling Parkinson's disease symptom.
  • Adaptive deep brain stimulation (aDBS) is a potential treatment.
  • Subthalamic nucleus (STN) firing patterns during freezing are not fully understood, especially with cognitive load.

Purpose of the Study:

  • Investigate STN firing patterns during gait freezing provoked by cognitive load in Parkinson's disease patients.
  • Determine if cognitive factors influence STN neural signatures associated with gait disturbances.

Main Methods:

  • Subthalamic nucleus microelectrode recordings from eight Parkinson's disease patients.
  • Utilized a virtual reality gait task with cognitive cues and dual-tasking.
  • Analyzed neural signals during freezing or motor slowing events.

Main Results:

  • Reduced theta frequency (3-8 Hz) firing in the STN during freezing episodes precipitated by dual-tasking.
  • Compared freezing trials (n=15) with unaffected trials (n=18).

Conclusions:

  • Identified a potential neurobiological basis for cognitive-gait interactions in Parkinson's disease.
  • Findings inform the development of adaptive deep brain stimulation protocols for gait freezing.