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Updating perspectives on spinal cord function: motor coordination, timing, relational processing, and memory below

James W Grau1, Kelsey E Hudson1, David T Johnston1

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Summary

The spinal cord, long viewed as mechanical, exhibits complex processing capabilities, including learning and pain modulation. This research highlights its potential for novel treatments following spinal cord injury (SCI).

Keywords:
ionic plasticitylearningmetaplasticitypainplasticityrecoveryspinal cord injury

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Area of Science:

  • Neuroscience
  • Spinal Cord Physiology
  • Learning and Memory

Background:

  • Historically, the spinal cord was considered a passive relay for signals, with higher-level cognitive functions attributed solely to the brain.
  • This perspective overlooked the spinal cord's potential for complex information processing and behavioral organization.

Purpose of the Study:

  • To review evidence challenging the traditional view of the spinal cord as purely mechanical.
  • To highlight the spinal cord's capacity for abstract processing, learning, and plasticity.
  • To explore the implications for understanding brain function and developing treatments for spinal cord injury (SCI).

Main Methods:

  • Review of scientific literature over the past 50 years.
  • Analysis of studies on spinal cord mechanisms, including NMDA receptor-mediated plasticity and GABA's inhibitory role.
  • Examination of research on spinal cord injury (SCI) effects on plasticity.

Main Results:

  • The spinal cord can organize coordinated behaviors like stepping and modulate pain signal processing.
  • Spinal cord mechanisms can abstract stimulus-stimulus (Pavlovian) and response-outcome (instrumental) relations, and infer stimulus regularity.
  • Spinal cord injury (SCI) can enhance plasticity by reducing GABA inhibition, potentially altering signal content relayed to the brain.

Conclusions:

  • The spinal cord possesses sophisticated processing capabilities, including learning, memory, and cognitive-like functions, analogous to brain processes.
  • Studying the spinal cord offers a valuable model system for understanding broader principles of neural function.
  • This research opens new therapeutic avenues for individuals with spinal cord injury (SCI).