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Related Experiment Videos

Motoneuron properties after operantly conditioned increase in primate H-reflex

J S Carp1, J R Wolpaw

  • 1Wadsworth Center for Laboratories and Research, New York State Department of Health, New York, USA.

Journal of Neurophysiology
|April 1, 1995
PubMed
Summary

Monkeys learned to control their triceps surae (TS) H-reflex through operant conditioning, demonstrating spinal cord plasticity. Intracellular recordings revealed changes in TS motoneurons, explaining the behavioral modifications.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Spinal Cord Plasticity

Background:

  • Operant conditioning can modify spinal cord activity.
  • The triceps surae (TS) H-reflex is a measurable indicator of spinal cord excitability.

Purpose of the Study:

  • To investigate spinal cord plasticity underlying behavioral changes in H-reflex modulation.
  • To characterize intracellular properties of TS motoneurons after H-reflex conditioning.

Main Methods:

  • Monkeys underwent HRup conditioning to increase TS H-reflex size.
  • Intracellular recordings were performed on TS motoneurons from conditioned and naive animals.

Main Results:

  • Successful conditioning led to significant H-reflex increases in the trained leg (188%) and control leg (134%).

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  • Intracellular recordings provided detailed electrophysiological data from 136 TS motoneurons.

    • Conclusions:

    • Operant conditioning induces spinal cord plasticity affecting TS motoneurons.
    • These motoneuronal changes are associated with the observed H-reflex modulation.