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Fictive motor patterns in chronic spinal cats.

K G Pearson1, S Rossignol

  • 1Department of Physiology, Université de Montréal, Quebec, Canada.

Journal of Neurophysiology
|December 1, 1991
PubMed
Summary

Chronic spinal cats exhibit distinct fictive motor patterns for locomotion, paw shake, and rhythmic leg flexion, influenced by stimulation methods. These patterns reveal the adaptability of the spinal cord

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Area of Science:

  • Neuroscience
  • Motor Control
  • Spinal Cord Research

Background:

  • Fictive motor patterns are neural network outputs that control rhythmic movements like locomotion.
  • Chronic spinal animals provide a model to study the residual motor control capabilities of the spinal cord after injury.

Purpose of the Study:

  • To investigate the different fictive motor patterns generated in chronic spinal cats.
  • To determine how stimulation methods and training influence these motor patterns.
  • To compare the motor patterns evoked by different stimuli in trained and untrained spinal cats.

Main Methods:

  • Recording fictive motor patterns in hind leg nerves of chronic spinal cats.
  • Evoking patterns via perineal skin stimulation and pharmacological agents (Clonidine, DOPA/Nialamide).
  • Analyzing pattern complexity and dependence on leg position and stimulation type (water jet, paw squeeze).

Main Results:

  • A locomotor-like pattern was evoked by perineal stimulation, facilitated by Clonidine.
  • Motor patterns in trained (late-spinal) cats were more complex and position-dependent than in untrained (early-spinal) cats.
  • Distinct patterns for paw shake and rhythmic leg flexion were observed in late-spinal animals in response to specific paw stimuli.

Conclusions:

  • Three distinct fictive motor patterns (locomotion, paw shake, rhythmic leg flexion) can be generated in chronic spinal cats.
  • The type and site of stimulation critically determine the evoked motor pattern.
  • These findings highlight the diverse motor behaviors the spinal cord can generate even after complete transection.

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