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Diencephalon: Thalamus and Information Relay01:27

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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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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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Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
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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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Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
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Related Experiment Video

Updated: Dec 23, 2025

Corticospinal Excitability Modulation During Action Observation
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Corticospinal Excitability Modulation During Action Observation

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Basal Ganglia Circuits for Action Specification.

Junchol Park1, Luke T Coddington1, Joshua T Dudman1

  • 1Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, Virginia 20147, USA;

Annual Review of Neuroscience
|April 19, 2020
PubMed
Summary
This summary is machine-generated.

The basal ganglia enable continuous movement control, crucial for actions requiring precise force and speed adjustments. This pathway refines voluntary movements, adding vigor and grace to actions.

Keywords:
action selectionbasal gangliadopaminemotor controlmotor cortexreinforcement learning

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Area of Science:

  • Neuroscience
  • Motor Control
  • Behavioral Biology

Background:

  • Behavior is often classified into goal-directed actions, but movements themselves are continuous.
  • Animals exhibit precise, graded control over movements, essential for tasks like predation and tool use.
  • The basal ganglia form a key pathway for motor control in vertebrates.

Purpose of the Study:

  • To explore the role of the basal ganglia in the continuous specification of movements.
  • To understand how this pathway contributes to the vigor and grace of voluntary actions.

Main Methods:

  • Review of existing literature on basal ganglia function.
  • Analysis of movement control in naturalistic and laboratory settings.
  • Discussion of the basal ganglia's role as a descending extrapyramidal pathway.

Main Results:

  • Movement control involves not only action selection but also continuous specification of movement parameters.
  • The basal ganglia play a critical role in modulating movement vigor and precision.
  • Graded control is fundamental for success in dynamic, naturalistic scenarios.

Conclusions:

  • The basal ganglia are essential for refining continuous movement control.
  • This pathway enhances voluntary actions, providing them with vigor and grace.
  • Understanding basal ganglia function offers insights into motor disorders and rehabilitation.