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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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Cross-Frequency Coupling in Descending Motor Pathways: Theory and Simulation.

Nirvik Sinha1,2, Julius P A Dewald1,3, Charles J Heckman1,4

  • 1Department of Physical Therapy and Human Movement Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States.

Frontiers in Systems Neuroscience
|January 30, 2020
PubMed
Summary

Cross-frequency coupling dominates indirect motor pathways, while iso-frequency coupling is prevalent in direct pathways. This study models neural oscillation coupling in motor command transmission, differentiating direct and indirect pathways.

Keywords:
Hogdkin–Huxley styled neuron modelcomputer simulationcross-frequency couplingdescending motor pathwaysn:m coherence

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Motor Control

Background:

  • Neural oscillation coupling is crucial for transmitting motor commands from the cortex to motoneuron pools via direct and indirect pathways.
  • Cortico-muscular coherence (iso-frequency coupling) is typically linked to the direct, mono-synaptic corticospinal pathway.
  • Indirect pathways involve multiple synaptic layers, potentially leading to cross-frequency coupling due to neuronal processing.

Purpose of the Study:

  • To theoretically evaluate how the number of synaptic layers in descending motor pathways affects cross-frequency coupling.
  • To differentiate the expression of cross-frequency coupling versus iso-frequency coupling in direct and indirect motor pathways.
  • To provide a computational basis for assessing motor command transmission through different pathways in humans.

Main Methods:

  • Simulated descending motor pathways with varying interneuron synaptic layers and a motoneuron pool using Hodgkin-Huxley neuron models.
  • Computed both cross-frequency and iso-frequency coupling using a generalized coherence measure (n:m coherence).
  • Analyzed the relationship between pathway structure (direct vs. indirect) and the dominance of coupling types.

Main Results:

  • Iso-frequency coupling was dominant in the mono-synaptic direct pathway.
  • Cross-frequency coupling was dominant in multi-synaptic indirect pathways.
  • Increased reliance on indirect pathways enhanced the dominance of cross-frequency coupling.

Conclusions:

  • The study differentiates the neural oscillation coupling patterns characteristic of direct versus indirect motor pathways.
  • Findings suggest that cross-frequency coupling is a marker for multi-synaptic indirect pathway involvement in motor command transmission.
  • This theoretical framework can inform future studies on motor control and neurological disorders affecting descending pathways.