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Related Concept Videos

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The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
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The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
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Study Motor Skill Learning by Single-pellet Reaching Tasks in Mice
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Striatal Dopamine Contributions to Skilled Motor Learning.

Chris D Phillips1,2,3, Alexander T Hodge4, Courtney C Myers1,5

  • 1Michigan Neuroscience Institute, University of Michigan, Ann Arbor, Michigan 48109.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 28, 2024
PubMed
Summary

Striatal dopamine release changes as mice learn skilled reaching. Dopamine signals shift from reward to predictive cues, indicating dopamine

Keywords:
dopaminemotor learningperformance prediction errorreward prediction errorskilled reachingstriatum

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Area of Science:

  • Neuroscience
  • Motor Control
  • Behavioral Science

Background:

  • Manual dexterity is crucial for daily activities and specialized skills.
  • Impaired dexterity is linked to neurological conditions like Parkinson's disease.
  • Corticostriatal circuits and dopamine signaling are vital for motor learning.

Purpose of the Study:

  • To investigate the role of striatal dopamine signaling in skilled motor learning.
  • To understand how dopamine dynamics change during the acquisition of a skilled reaching task.
  • To explore regional differences in dopamine regulation within the striatum.

Main Methods:

  • Fiber photometry with a genetically encoded dopamine sensor was used in male and female mice.
  • Mice were trained on a skilled reaching task to assess motor learning.
  • Striatal dopamine release was measured during task performance and learning.

Main Results:

  • Dopamine levels increased during skilled reaching, peaking at reward consumption.
  • Dopamine dynamics varied across striatal subregions, with faster signaling in the dorsolateral striatum.
  • With learning, dopamine signaling shifted from reward to predictive cues, especially in medial and ventral striatum.
  • Performance prediction errors were observed, with reduced dopamine after unsuccessful reaches.

Conclusions:

  • Striatal dopamine dynamics are integral to skilled motor learning and behavior.
  • Dopamine signaling adapts during learning, shifting towards predictive cues.
  • Differential regulation of dopamine across striatal subregions suggests specialized roles in motor control.