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Related Concept Videos

Parkinson's Disease: Treatment01:24

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Neurodegenerative disorders, such as Parkinson's Disease (PD), involve the gradual and irreversible destruction of neurons in particular brain areas. These disorders exhibit standard features like proteinopathies, selective vulnerability of some neurons, and an interaction of intrinsic properties, genetics, and environmental influences in neural injury.
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Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is...
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Controlling Parkinson's Disease With Adaptive Deep Brain Stimulation
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Encoding type, medication, and deep brain stimulation differentially affect memory-guided sequential reaching

Fabian J David1, Yessenia M Rivera1, Tara K Entezar2

  • 1Department of Physical Therapy and Human Movement Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL, United States.

Frontiers in Neurology
|November 3, 2022
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Summary

Parkinson's disease impairs memory-guided movements. This study found that visual encoding improves movement speed and accuracy, while both medication and subthalamic nucleus deep brain stimulation (STN-DBS) offer distinct benefits for movement restoration.

Keywords:
Parkinson's diseaseencodingperipheral-vision levodopaproprioceptionsubthalamic nucleus deep brain stimulation (STN-DBS)

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Area of Science:

  • Neuroscience
  • Motor Control
  • Movement Disorders

Background:

  • Memory-guided movements are crucial for daily function but are notably impaired in Parkinson's disease (PD).
  • Existing research on how memory encoding and PD treatments (medication, STN-DBS) affect these movements is limited and yields inconsistent results.

Purpose of the Study:

  • To investigate the impact of different memory encoding types (vision vs. proprioception) on memory-guided movements in PD.
  • To examine the effects of medication and subthalamic nucleus deep brain stimulation (STN-DBS) on movement characteristics (amplitude, error, velocity) in PD patients.
  • To compare the efficacy of STN-DBS versus medication in improving motor performance.

Main Methods:

  • Two memory-guided sequential reaching tasks were employed, differentiating between peripheral-vision and proprioception encoding.
  • Data were collected from Parkinson's disease patients (pre- and post-STN-DBS surgery) and healthy controls.
  • Movement parameters including reaching amplitude, error, and velocity were analyzed under medication-on/off and STN-DBS-on/off conditions.

Main Results:

  • Peripheral-vision encoding resulted in faster and more accurate reaches, though it exacerbated amplitude deficits in PD patients.
  • Medication improved movement error for both encoding types and increased velocity specifically for vision-encoded movements.
  • STN-DBS enhanced movement amplitude and velocity for both encoding types but increased error during proprioception encoding.
  • STN-DBS outperformed medication in increasing amplitude and velocity, while medication was more effective in reducing movement error.

Conclusions:

  • Encoding type significantly influences memory-guided movement performance and PD-related deficits.
  • Both medication and STN-DBS offer therapeutic benefits for motor impairments in PD, with differential effects based on encoding modality.
  • STN-DBS and medication represent complementary strategies for managing PD motor symptoms, with STN-DBS showing advantages in amplitude and velocity, and medication in error reduction.