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Related Concept Videos

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...
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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 which...
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Related Experiment Video

Updated: Jun 18, 2026

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

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Published on: July 24, 2019

Early Parkinson's disease: longitudinal changes in brain activity during sequence learning.

Maren Carbon1, Kathrin Reetz, M Felice Ghilardi

  • 1Center for Neurosciences, The Feinstein Institute for Medical Research, Manhasset, NY 11030, USA. david1@nshs.edu

Neurobiology of Disease
|November 11, 2009
PubMed
Summary

Sequence learning declines over two years in early Parkinson's disease (PD). This cognitive decline correlates with reduced brain activity in key areas, suggesting neural changes impact learning abilities.

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Area of Science:

  • Neuroscience
  • Cognitive Neurology

Background:

  • Impaired sequence learning is a common cognitive deficit in Parkinson's disease (PD).
  • The longitudinal progression of this sequence learning impairment in PD is not well understood.

Purpose of the Study:

  • To investigate the time course of sequence learning deficits in early Parkinson's disease.
  • To examine changes in task-related cerebral blood flow associated with sequence learning over a two-year period in PD patients.

Main Methods:

  • Longitudinal assessment of sequence learning performance in 13 early-stage Parkinson's disease patients.
  • H(2)(15)O Positron Emission Tomography (PET) scans were conducted at baseline and after two years.
  • Comparison with sequence learning performance and brain activity in 10 healthy control subjects.

Main Results:

  • A trend towards decline in sequence learning performance was observed over two years in PD patients (p=0.08).
  • Significant reductions in learning-related brain activation were noted in parietal, temporo-occipital, and right dorsolateral prefrontal cortex areas.
  • Activation in these regions decreased from normal at baseline to subnormal levels at two years (p<0.01).
  • Higher learning performance correlated with significant hippocampal activation (p<0.005).

Conclusions:

  • Sequence learning abilities and associated neural activity decline over two years in early Parkinson's disease.
  • These findings suggest a decline in learning-related neural activity in cortical regions susceptible to Lewy body pathology.
  • Hippocampal activation may play a role in maintaining sequence learning performance over time in PD.