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Related Experiment Videos

Period differences between segmental oscillators produce intersegmental phase differences in the leech heartbeat

Mark A Masino1, Ronald L Calabrese

  • 1Biology Department, Emory University, 1510 Clifton Road, Atlanta, GA 30322, USA.

Journal of Neurophysiology
|March 6, 2002
PubMed
Summary

In leech heartbeat networks, inherent period differences between oscillators establish phase relationships. The faster oscillator leads, demonstrating the role of excitability gradients in pattern generation.

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Area of Science:

  • Neuroscience
  • Computational Biology
  • Systems Neuroscience

Background:

  • Segmental oscillators in pattern generating networks maintain constant intersegmental phase relationships.
  • The leech heartbeat central pattern generator exhibits regular phase relationships within preparations but variability between them.

Purpose of the Study:

  • To investigate how phase relationships are established in the leech heartbeat timing network.
  • To assess the role of inherent period differences, as per the excitability-gradient hypothesis, in setting these phase relationships.

Main Methods:

  • Reversible uncoupling of segmental oscillators using a sucrose knife.
  • Pharmacological manipulation of individual oscillators via a split bath technique.
  • Correlation analysis of inherent period differences and observed phase differences.

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Main Results:

  • Inherent period differences between segmental oscillators (G3 and G4) were observed in most preparations (20/26).
  • Faster cycle periods consistently led in phase, proportional to the period difference.
  • Altering period differences pharmacologically resulted in predictable phase shifts upon recoupling.

Conclusions:

  • Inherent period differences between segmental oscillators are a key factor in establishing phase relationships.
  • The findings support the excitability-gradient hypothesis in the leech heartbeat central pattern generator.
  • The faster oscillator dictates the network's cycle period when coupled.