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Related Experiment Videos

Increased variability in motor output with brain-spinal cord interaction

R Jung1, J Jung, B Losch

  • 1Department of Electrical Engineering, University of Kentucky, Lexington 40506-0070, USA.

Biomedical Sciences Instrumentation
|January 1, 1997
PubMed
Summary

The reticulo-spino-reticular loop in lamprey spinal cord circuitry increases locomotor output variability. This study investigated how this neural loop impacts rhythmic motor control in lamprey locomotion.

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Area of Science:

  • Neuroscience
  • Locomotion

Background:

  • Lamprey spinal cord central pattern generators (CPGs) produce rhythmic locomotion.
  • A reticulo-spino-reticular loop involving reticular neurons interacts with lamprey CPGs.

Purpose of the Study:

  • To test the hypothesis that the reticulo-spino-reticular loop increases variability in locomotor output.
  • To understand the role of this neural loop in modulating motor control.

Main Methods:

  • Induced fictive locomotion in isolated lamprey brain-spinal cord preparations using excitatory amino acids.
  • Suppressed reticular neuron activity by superfusing with zero Ca2+ saline or by detaching the brain.
  • Analyzed ventral root (VR) activity using autocorrelation and power spectral density to quantify locomotor output variability.

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Main Results:

  • The reticulo-spino-reticular loop was found to be functional in control conditions.
  • Suppression or removal of the reticular loop led to decreased variability in locomotor output.
  • Increased variability in signal amplitude, burst duration, and cycle period was observed when the loop was intact.

Conclusions:

  • The reticulo-spino-reticular loop significantly contributes to increased variability in lamprey locomotor output.
  • This neural circuitry plays a crucial role in modulating the rhythmic motor patterns underlying locomotion.