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Related Concept Videos

Parkinson Disease l: Introduction01:24

Parkinson Disease l: Introduction

Parkinson’s disease is a chronic, progressive neurodegenerative disorder that primarily affects movement. It is characterized by motor symptoms such as resting tremors, muscle rigidity, bradykinesia (slowness of movement), and postural instability. Patients may notice hand tremors at rest, stiffness during movement, or a shuffling gait. In addition to motor features, non-motor symptoms include sleep disturbances, mood and behavioral changes, constipation, and cognitive impairment, all of which...
Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
Parkinson's Disease: Overview01:15

Parkinson's Disease: Overview

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 to...
Parkinson's Disease: Treatment01:24

Parkinson's Disease: Treatment

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.
Parkinson's Disease is primarily a result of the loss of dopaminergic neurons in the substantia nigra pars compacta. The cornerstone of its...
Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...
Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...

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Related Experiment Video

Updated: May 23, 2026

The Use of Primary Human Fibroblasts for Monitoring Mitochondrial Phenotypes in the Field of Parkinson's Disease
15:09

The Use of Primary Human Fibroblasts for Monitoring Mitochondrial Phenotypes in the Field of Parkinson's Disease

Published on: October 3, 2012

Subtype-specific statistical causalities in parkinsonian tremor.

E Florin1, M Himmel, C Reck

  • 1Department of Neurology, University Hospital Cologne, Kerpener Strasse 62, 50937 Köln, Germany. Esther.Florin@uk-koeln.de

Neuroscience
|March 21, 2012
PubMed
Summary

Parkinson's disease tremor pathophysiology differs between subtypes. In akinetic-rigid patients, the subthalamic nucleus influences muscle tremor. In tremor-dominant patients, muscle activity influences the subthalamic nucleus, suggesting distinct disease mechanisms.

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Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease
08:09

Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease

Published on: January 7, 2014

Related Experiment Videos

Last Updated: May 23, 2026

The Use of Primary Human Fibroblasts for Monitoring Mitochondrial Phenotypes in the Field of Parkinson's Disease
15:09

The Use of Primary Human Fibroblasts for Monitoring Mitochondrial Phenotypes in the Field of Parkinson's Disease

Published on: October 3, 2012

Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease
08:09

Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease

Published on: January 7, 2014

Area of Science:

  • Neuroscience
  • Movement Disorders
  • Biomedical Engineering

Background:

  • Tremor is a primary Parkinson's disease symptom, but its underlying pathophysiology is not fully understood.
  • Previous studies suggested oscillatory coupling between the subthalamic nucleus and muscles, but causality was not established.
  • Understanding tremor generation is crucial for developing targeted therapies for Parkinson's disease.

Purpose of the Study:

  • To investigate the statistical causality between subthalamic local field potentials and muscle activity during tremor in Parkinson's disease subtypes.
  • To differentiate the direction of causality in tremor-dominant versus akinetic-rigid Parkinson's disease patients.
  • To explore the relationship between stimulation sites and causal pathways in tremor-dominant Parkinson's disease.

Main Methods:

  • Analysis of intraoperatively recorded local field potentials from the subthalamic area and electromyographic (EMG) activity from arm muscles during tremor episodes.
  • Application of squared partial directed coherence, a statistical causality measure, to assess directional influence.
  • Comparison of causality patterns between akinetic-rigid (n=6) and tremor-dominant (n=8) Parkinson's disease patients.

Main Results:

  • Significant differences in statistical causality were found between Parkinson's disease subtypes.
  • In akinetic-rigid patients, the subthalamic region was more frequently causal for EMG tremor activity.
  • In tremor-dominant patients, EMG tremor activity was more frequently causal for subthalamic activity, with stimulation sites often coinciding with peripheral input causality.

Conclusions:

  • The pathophysiological mechanisms generating tremor differ fundamentally between tremor-dominant and akinetic-rigid Parkinson's disease subtypes.
  • Causality direction between the subthalamic nucleus and muscles is reversed in the two subtypes.
  • These findings suggest distinct neural circuit dysfunctions underlying tremor in different Parkinson's disease phenotypes.