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Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease
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Parkinson's disease as a system-level disorder.

Daniele Caligiore1, Rick C Helmich2, Mark Hallett3

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NPJ Parkinson'S Disease
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Summary

Parkinson's disease may stem from the entire basal ganglia-cortex-cerebellum system, not just the basal ganglia. This new view could lead to better Parkinson's disease treatments targeting this interconnected neural network.

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Area of Science:

  • Neuroscience
  • Neurology
  • Systems Neuroscience

Background:

  • Parkinson's disease (PD) has traditionally been linked solely to the basal ganglia.
  • This limited view overlooks the crucial role of interactions between the basal ganglia, cortex, and cerebellum in PD symptoms.
  • Motor and cognitive functions rely on the integrated activity of these brain regions.

Purpose of the Study:

  • To propose a theoretical framework for Parkinson's disease (PD) as a system-wide dysfunction.
  • To reframe PD understanding beyond the basal ganglia in isolation.
  • To explore how basal ganglia-cortex-cerebellum interactions contribute to core PD symptoms.

Main Methods:

  • Review of recent evidence on neural circuits in Parkinson's disease.
  • Theoretical modeling of the basal ganglia-cortex-cerebellum system in PD.
  • Analysis of overlapping neural circuits implicated in PD symptoms.

Main Results:

  • Key PD symptoms like tremor, freezing, and action sequencing impairments can be explained by dysfunction within the basal ganglia-cortex-cerebellum system.
  • Evidence suggests partially overlapping neural circuits involving these areas contribute to PD pathophysiology.
  • Altered interactions within this system, not just basal ganglia deficits, are proposed as the cause of PD symptoms.

Conclusions:

  • Parkinson's disease (PD) should be viewed as a disorder of the entire basal ganglia-cortex-cerebellum system.
  • Understanding this system's involvement is vital for developing novel therapeutic strategies for PD.
  • Future therapies may target the interconnected neural network rather than solely the basal ganglia.