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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.
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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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Related Experiment Video

Updated: Jul 14, 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

Inhibitory control and spatial working memory in Parkinson's disease.

Caroline Gurvich1,2,3, Nellie Georgiou-Karistianis1, Paul B Fitzgerald3

  • 1Experimental Neuropsychology Research Unit, School of Psychology, Psychiatry and Psychological Medicine, Monash University, Clayton, Victoria, Australia.

Movement Disorders : Official Journal of the Movement Disorder Society
|May 23, 2007
PubMed
Summary

Individuals with Parkinson's disease (PD) show impaired inhibitory control in eye movements, affecting saccadic tasks. However, their spatial working memory remains intact, suggesting specific fronto-striatal pathway dysfunction.

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Last Updated: Jul 14, 2026

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Science

Background:

  • Parkinson's disease (PD) is characterized by motor deficits and cognitive impairments, particularly affecting prefrontal cortex functions.
  • Eye movement analysis offers insights into sensorimotor and cognitive control mechanisms.
  • Inhibitory control and working memory are crucial for daily tasks and are often compromised in PD.

Purpose of the Study:

  • To investigate inhibitory control and spatial working memory in the saccadic system of individuals with Parkinson's disease.
  • To explore how PD affects the suppression of reflexive saccades and the generation of specific saccade types.
  • To assess spatial working memory using single and two-step memory-guided tasks in PD patients.

Main Methods:

  • Studied 13 individuals with mild-moderate PD and 13 age-matched controls using eye movement paradigms.
  • Assessed inhibitory control via tasks involving saccade suppression, oddball targets, and memory-guided saccades.
  • Evaluated spatial working memory using single and two-step memory-guided tasks.

Main Results:

  • PD patients exhibited more response selection errors in an oddball task.
  • Reduced suppression of inappropriate reflexive saccades was observed in PD during memory-guided tasks.
  • Increased express and anticipatory saccades were noted in the PD group.
  • Spatial working memory was preserved in individuals with PD.

Conclusions:

  • Findings suggest dysfunction in fronto-striatal and prefrontal-collicular pathways in PD.
  • These pathways are implicated in the control of eye movement suppression and selection.
  • PD specifically impacts inhibitory control mechanisms within the saccadic system, while spatial working memory remains largely unaffected.