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Related Experiment Videos

Multiple oscillators provide metastability in rhythm generation.

H S Chang1, K Staras, M P Gilbey

  • 1Autonomic Neuroscience Institute, Department of Physiology, Royal Free and University College Medical School, University College London, London NW3 2PF, United Kingdom.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|June 24, 2000
PubMed
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Biological rhythms emerge from multiple oscillators. This study shows sympathetic nervous system rhythms remain stable despite weak coupling, offering flexible physiological responses.

Area of Science:

  • Physiology
  • Neuroscience
  • Complex Systems

Background:

  • Biological rhythms, like cardiac and circadian, involve multiple oscillators.
  • Synchronization via mutual entrainment is a proposed mechanism for stable population rhythms.
  • Mutual entrainment is unlikely for weakly coupled or uncoupled oscillators.

Purpose of the Study:

  • Investigate the stability of sympathetic oscillator population rhythms.
  • Examine the role of external driving forces on population rhythm stability.
  • Understand rhythm generation in systems without mutual entrainment.

Main Methods:

  • Subjecting sympathetic oscillator populations to periodic driving forces (lung inflation cycles).
  • Analyzing population rhythm stability across a range of driving frequencies.

Related Experiment Videos

  • Investigating dynamic interactions between the driving force and individual oscillators.

    • Main Results:

    • Population rhythms remained stable over a wider driving frequency range than individual oscillators.
    • Population rhythmicity persisted even without 1:1 frequency-locking of individual oscillators to the drive.
    • Linear and nonlinear dynamic interactions mediate population metastability.

    Conclusions:

    • Stable population rhythms can be generated without mutual entrainment of constituent oscillators.
    • Sympathetic nervous system rhythms exhibit metastability, enabling stable and flexible patterned responses.
    • This mechanism is crucial for physiological processes like thermoregulation.