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Related Concept Videos

Parkinson's Disease: Overview01:15

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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’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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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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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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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...
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Related Experiment Video

Updated: May 2, 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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Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking

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Perceived and performance-based executive dysfunction in Parkinson's disease.

Kimberly E Lanni1, Jessica M Ross, Christopher I Higginson

  • 1a VA Northern California Health Care System , Mather , CA , USA.

Journal of Clinical and Experimental Neuropsychology
|March 12, 2014
PubMed
Summary
This summary is machine-generated.

Executive dysfunction in Parkinson's disease (PD) is linked to processing speed. Early-stage PD patients show more self-reported task initiation issues than caregiver reports suggest.

Keywords:
Behavior Rating Inventory of Executive Function–Adult VersionDepressionExecutive functionsProcessing speedRatings

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Area of Science:

  • Neuroscience
  • Neurology
  • Cognitive Science

Background:

  • Executive dysfunction is a frequent symptom in early Parkinson's disease (PD).
  • Understanding the relationship between subjective and objective executive function measures is crucial for PD management.
  • Mild cognitive impairment is common in PD and impacts daily functioning.

Purpose of the Study:

  • To investigate the correlation between self-reported, informant-reported, and performance-based executive functions in individuals with early-stage PD and mild cognitive impairment.
  • To identify neuropsychological predictors of executive dysfunction in this population.

Main Methods:

  • Comparison of self- and informant-report executive function measures.
  • Assessment of performance-based neuropsychological tests (e.g., processing speed, semantic verbal fluency).
  • Statistical analysis to determine predictors of executive dysfunction in PD patients.

Main Results:

  • Parkinson's disease (PD) patients reported greater difficulty with task initiation than their caregivers observed.
  • Processing speed was a significant predictor of self-reported executive dysfunction in PD, followed by depression.
  • Processing speed and semantic verbal fluency predicted informant-reported executive dysfunction in PD.

Conclusions:

  • Processing speed is vital for everyday executive task performance in individuals with Parkinson's disease (PD).
  • Discrepancies between self- and informant-reports highlight the complexity of executive dysfunction in PD.
  • Cognitive assessments, particularly processing speed, are important for understanding and managing executive deficits in PD.