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Related Experiment Video

Updated: Nov 17, 2025

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking
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Exploring Bottom-Up Visual Processing and Visual Hallucinations in Parkinson's Disease With Dementia.

Nicholas Murphy1,2, Alison Killen1, Rajnish Kumar Gupta3

  • 1Faculty of Medical Sciences, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, United Kingdom.

Frontiers in Neurology
|February 15, 2021
PubMed
Summary

Visual hallucinations in Parkinson's disease with dementia (PDD) may involve altered visual processing. While PDD patients showed some visual evoked potential (VEP) differences, specific VEP changes did not correlate with complex visual hallucinations.

Keywords:
Lewy bodyParkinson's disease dementiavisual evoked potentialvisual hallucinationvisual processing

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neurology

Background:

  • Visual hallucinations (VH) are prevalent in Parkinson's disease with dementia (PDD), impacting up to 65% of patients.
  • Current models suggest impaired executive control over the visuo-perceptual system contributes to VH.
  • The role of bottom-up visual processing in PDD-associated VH remains unclear, despite prior associations between visual evoked potentials (VEPs) and VH in early Parkinson's disease (PD).

Purpose of the Study:

  • To investigate differences in VEP amplitude and latency between healthy controls and PDD patients with varying severities of VH.
  • To explore the relationship between VEP measures and the presence and severity of complex visual hallucinations (CVH) in PDD.

Main Methods:

  • Compared pattern reversal VEPs (amplitude and latency) in healthy controls (n=21) and PDD patients (n=34).
  • Stratified PDD patients based on the severity of their visual hallucinations.
  • Analyzed VEP data in relation to the presence of VH and CVH.

Main Results:

  • PDD patients exhibited increased N2 latency compared to healthy controls, indicating altered visual pathway physiology.
  • No significant differences in VEP measures were observed between PDD patients with complex VH (n=17) and those without VH.
  • VEP findings partially support existing literature on declining visual system function in PDD and subtle differences between patients with and without VH.

Conclusions:

  • VEP alterations in PDD patients suggest underlying changes in visual system physiology.
  • The study did not find a strong correlation between specific VEP measures and the severity of complex visual hallucinations in PDD.
  • Further research is needed to fully elucidate the mechanisms of VH in PDD, particularly the role of bottom-up visual processing.