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The cerebellum, also known as the "little brain," is located in the posterior cranial fossa, inferior to the tentorium cerebelli and dorsal to the brainstem. It plays a significant role in motor control, coordination, and proprioception.
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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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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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Each cerebral hemisphere can be divided into three main regions. The outermost region, the cerebral cortex, is a thin layer (2 to 4 millimeters thick) made up of gray matter, consisting of neuron cell bodies, dendrites, glial cells, and blood vessels. The middle region, or white matter, is primarily composed of myelinated nerve fibers organized into three types of large tracts: association fibers, commissures, and projection fibers. Association fibers connect different areas within the same...
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What Can We Learn from Synaptic Connectivity Maps about Cerebellar Internal Models?

Ludovic Spaeth1,2, Philippe Isope3

  • 1Institut des Neurosciences Cellulaires et Intégratives, CNRS, Université de Strasbourg, 67084, Strasbourg, France.

Cerebellum (London, England)
|April 8, 2022
PubMed
Summary

The cerebellum may store internal models of body coordinates, based on synaptic connections. These internal models are proposed to be task-specific and context-dependent for each individual.

Keywords:
cerebelluminternal modelssensorimotor adaptationsynaptic transmission

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Area of Science:

  • Neuroscience
  • Motor Control Research
  • Computational Neuroscience

Background:

  • The cerebellum's role in motor control, learning, and timing is well-established.
  • Despite detailed anatomical and synaptic plasticity knowledge, its precise computational function remains debated.

Purpose of the Study:

  • To review recent advances in understanding cerebellar computation.
  • To support the hypothesis that the cerebellum stores internal models of body coordinates.

Main Methods:

  • Review of recent scientific literature.
  • Analysis of functional synaptic connectivity between cerebellar granule cells and Purkinje cells.

Main Results:

  • Evidence suggests functional synaptic connectivity supports the internal model hypothesis.
  • The cerebellum's computation is linked to storing representations of body coordinates.

Conclusions:

  • The cerebellum likely stores internal models of body coordinates.
  • These internal models are proposed to be specific to individual tasks and locomotor contexts.