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Related Concept Videos

Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

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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...
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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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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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Parkinson Disease l: Introduction01:24

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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...
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Schizophrenia is a neurodevelopmental disorder whose origins are rooted in complex genetic components. Despite our burgeoning understanding, the pathophysiology of this disorder remains incompletely deciphered.
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Schizophrenia is a complex mental health disorder that can manifest with various positive symptoms, including thought, movement, and behavior disorders. These symptoms significantly disrupt cognitive and motor functions, leading to profound effects on an individual's ability to engage with the world.
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Related Experiment Video

Updated: Apr 25, 2026

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking
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Visual hallucinations in Parkinson's disease: theoretical models.

Alana J Muller1, James M Shine, Glenda M Halliday

  • 1Brain & Mind Research Institute, University of Sydney, Sydney, New South Wales, Australia.

Movement Disorders : Official Journal of the Movement Disorder Society
|August 27, 2014
PubMed
Summary

Visual hallucinations in Parkinson's disease (PD) are complex. Understanding their cause requires integrating molecular, cognitive, and behavioral data, exploring hypotheses like dream intrusion and attention deficits.

Keywords:
Parkinson's diseasevisual hallucinationsvisual misperceptions

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Area of Science:

  • Neuroscience
  • Neurology

Background:

  • Visual hallucinations are a significant burden in Parkinson's disease (PD).
  • Understanding the underlying mechanisms of visual hallucinations in PD is challenging due to widespread pathology.

Purpose of the Study:

  • To review and synthesize leading hypothetical frameworks for visual hallucinations in Parkinson's disease.
  • To highlight the essential aspects a unifying hypothesis must explain.

Main Methods:

  • Literature review of current hypotheses on visual hallucinations in PD.
  • Analysis of competing frameworks including dream imagery, reality monitoring, and visual attention deficits.

Main Results:

  • Several competing hypotheses exist for visual hallucinations in PD.
  • Key aspects that a unifying theory must address include dream imagery, reality monitoring, and visual perception/attention.

Conclusions:

  • An integrative approach across multiple levels of investigation is necessary to understand visual hallucinations in PD.
  • Further research is needed to develop a unifying hypothesis that reconciles existing frameworks.