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Related Experiment Video

Updated: Apr 24, 2026

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Proprioceptive feedback modulates coordinating information in a system of segmentally distributed microcircuits.

Brian Mulloney1, Carmen Smarandache-Wellmann2, Cynthia Weller3

  • 1Department of Neurobiology, Physiology, and Behavior, University of California, Davis, California; bcmulloney@ucdavis.edu.

Journal of Neurophysiology
|September 5, 2014
PubMed
Summary

Crayfish swimmeret neural circuits adapt to imposed movements by altering motor output and intersegmental coordination. Sensory feedback from stretch receptors fine-tunes rhythmic activity for efficient locomotion.

Keywords:
burst strengthcoordinationefference copylocomotionproprioceptor

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Locomotion Control

Background:

  • Crustacean swimmerets generate metachronal propulsion via modular neural circuits.
  • Intersegmental coordinating circuits synchronize these modules with specific phase differences.

Purpose of the Study:

  • To investigate how crayfish neural circuits controlling swimmerets respond to imposed movements.
  • To understand the role of sensory feedback in modulating rhythmic neural activity.

Main Methods:

  • Utilized a semi-intact crayfish preparation with one attached swimmeret and isolated central nervous system (CNS).
  • Recorded extracellularly from power-stroke (PS) and return-stroke (RS) nerves, coordinating axons, and homologous nerves in adjacent segments.
  • Manipulated limb position (maintained retractions) and voltage-clamped nonspiking stretch receptors (NSSRs).

Main Results:

  • Maintained retractions weakened PS bursts, strengthened RS bursts, and altered coordinating axon efference copies without changing cycle period.
  • Changes in efference copies modified the phase and duration, but not strength, of PS bursts in neighboring segments.
  • Voltage clamping NSSRs altered burst durations and strengths in innervating axons and their efference copies.

Conclusions:

  • Swimmeret neural modules dynamically adjust motor output and intersegmental coordination in response to mechanical perturbations.
  • Nonspiking stretch receptors provide crucial sensory feedback that modulates rhythmic activity and efference copy signals.
  • The system exhibits rapid adaptation and reversibility, ensuring efficient and robust locomotion control.