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Cellular switches orchestrate rhythmic circuits.

Guillaume Drion1, Alessio Franci2, Rodolphe Sepulchre3

  • 1Department of Electrical Engineering and Computer Science, University of Liege, Liege, Belgium. gdrion@uliege.be.

Biological Cybernetics
|September 5, 2018
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Summary
This summary is machine-generated.

A novel cellular switching mechanism, utilizing a slow negative conductance, enables neuronal circuits to generate adaptable and controllable motor rhythms. This mechanism enhances circuit robustness and adaptability, overcoming limitations of fixed synaptic tuning in central pattern generators.

Keywords:
Central pattern generatorsMathematical modelingNeuromodulation

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Area of Science:

  • Neuroscience
  • Computational Biology
  • Systems Neuroscience

Background:

  • Small inhibitory neuronal circuits are crucial for generating and modulating motor function rhythms.
  • Existing models often rely on fixed synaptic connectivity, leading to rigid and fragile circuit dynamics.
  • Central pattern generators (CPGs) require adaptable mechanisms for robust motor control.

Purpose of the Study:

  • To highlight the role of a cellular switching mechanism in orchestrating neuronal circuits.
  • To demonstrate how this mechanism imparts reconfigurability, robustness, and adaptability to circuit rhythms.
  • To propose a specific biophysical mechanism—a slow negative conductance—as the basis for this cellular switch.

Main Methods:

  • Analysis of a well-studied neural network architecture controlling pyloric and gastric rhythms in crabs.
  • Mathematical modeling incorporating a slow negative conductance, often overlooked in CPG research.
  • Comparative analysis of circuit properties with and without the proposed cellular switching mechanism.

Main Results:

  • The cellular switch allows neuronal circuits to be reconfigurable, robust, and externally controllable.
  • Circuits lacking this mechanism exhibit rhythms dependent on rigid synaptic tuning, making them fragile and difficult to control.
  • The slow negative conductance provides a simple yet effective mechanism for cellular switching.

Conclusions:

  • A cellular switching mechanism, mediated by slow negative conductance, is key to orchestrating adaptable and controllable neuronal rhythms.
  • This mechanism offers significant advantages over models relying solely on synaptic tuning for CPGs.
  • The proposed conductance is simple to model and crucial for computational studies of rhythmic circuit neuromodulation.