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Related Concept Videos

Parkinson Disease ll: Pathophysiology01:24

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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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Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
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The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...
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Reassessing models of basal ganglia function and dysfunction.

Alexandra B Nelson1, Anatol C Kreitzer

  • 1The Gladstone Institutes, San Francisco, California 94158;

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The basal ganglia, crucial for motor control, also significantly impact cognition and emotion. This review explores historical and recent findings on basal ganglia functions in these diverse roles.

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Parkinson's diseasedopaminestriatum

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Behavioral Neuroscience

Background:

  • The basal ganglia are subcortical nuclei traditionally linked to motor control.
  • Emerging evidence highlights their significant roles in cognitive and affective processes.
  • Understanding basal ganglia function is key to various neurological and psychiatric disorders.

Purpose of the Study:

  • To review historical models of basal ganglia function.
  • To synthesize recent research on basal ganglia's roles in motor, cognitive, and affective control.
  • To evaluate evidence supporting or refuting existing hypotheses.

Main Methods:

  • Literature review of historical and contemporary studies.
  • Analysis of findings from animal models and human research.
  • Synthesis of data to test hypotheses on basal ganglia function.

Main Results:

  • Traditional motor control models are being expanded.
  • Evidence strongly supports basal ganglia involvement in cognition and emotion.
  • Recent studies provide direct tests of basal ganglia hypotheses.

Conclusions:

  • Basal ganglia function extends beyond motor control to encompass complex cognitive and affective processes.
  • Current research validates and refines models of basal ganglia's multifaceted roles.
  • Further investigation is needed to fully elucidate basal ganglia mechanisms in health and disease.