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Related Concept Videos

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...
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 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...
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...
Neural Regulation01:37

Neural Regulation

Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.

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Brain : a journal of neurology·2007
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[(123)I]beta-CIT SPECT is a useful method for monitoring dopaminergic degeneration in early stage Parkinson's disease.

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Rigidity decreases resting tremor intensity in Parkinson's disease: A [(123)I]beta-CIT SPECT study in early, nonmedicated patients.

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Related Experiment Video

Updated: Jul 4, 2026

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking
07:26

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking

Published on: September 26, 2019

Mental dysfunction in Parkinson's disease.

E C Wolters1, C M Francot

  • 1Graduate School for Neurosciences Amsterdam, Department of Neurology, Academisch ziekenhuis Vrije Universiteit, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands.

Parkinsonism & Related Disorders
|July 2, 2008
PubMed
Summary
This summary is machine-generated.

Parkinson's disease (PD) involves dopamine cell degeneration, leading to motor, cognitive, and mood issues. Psychosis in PD may stem from misinterpreting sensory input due to reduced dopamine signaling.

More Related Videos

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease
10:28

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease

Published on: July 24, 2019

Related Experiment Videos

Last Updated: Jul 4, 2026

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking
07:26

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking

Published on: September 26, 2019

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease
10:28

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease

Published on: July 24, 2019

Area of Science:

  • Neuroscience
  • Neurology
  • Pathology

Background:

  • Parkinson's disease (PD) is characterized by the degeneration of dopamine-producing cells in the substantia nigra and ventral tegmentum.
  • This results in dopamine deficiency, affecting motor, association, and limbic circuits, leading to diverse symptoms.
  • Drug-induced psychosis affects 15-20% of patients on dopaminergic agents.

Purpose of the Study:

  • To elucidate the pathological mechanisms underlying Parkinson's disease.
  • To explain the development of motor deficits, cognitive disturbances, mood disorders, and psychosis in PD patients.
  • To explore the neurobiological basis of psychosis in Parkinson's disease.

Main Methods:

  • The study is based on a review of existing literature and pathological findings in Parkinson's disease.
  • Analysis of the roles of dopamine (DA), noradrenergic, serotonergic, and cholinergic systems in PD.
  • Examination of the impact of neurodegeneration on cortico-subcortical circuits.

Main Results:

  • Degeneration of nigrostriatal dopamine (A9) pathways causes motor dysfunction and subtle cognitive deficits.
  • Loss of ventral tegmental area cells and reduced dopamine innervation of mesocorticolimbic regions lead to overt motor, cognitive, and mood impairments.
  • Psychosis in PD is hypothesized to result from a reduced signal-to-noise ratio in sensory processing due to dopamine deficiency.

Conclusions:

  • Parkinson's disease involves widespread neurochemical deficits impacting multiple brain circuits.
  • The neuropsychological deficit in PD is characterized by an impaired ability to internally regulate behavior.
  • Dopamine deficiency contributes significantly to psychosis in PD by disrupting sensory information processing.