State-dependent rhythmogenesis in a half-center locomotor CPG (Ausburn et al 2017)

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"The spinal locomotor central pattern generator (CPG) generates rhythmic activity with alternating flexion and extension phases. This rhythmic pattern is likely to result from inhibitory interactions between neural populations representing flexor and extensor half-centers. However, it is unclear whether the flexor-extensor CPG has a quasi-symmetric organization with both half-centers critically involved in rhythm generation, features an asymmetric organization with flexor-driven rhythmogenesis, or comprises a pair of intrinsically rhythmic half-centers. There are experimental data that support each of the above concepts but appear to be inconsistent with the others. In this theoretical/modeling study, we present and analyze a CPG model architecture that can operate in different regimes consistent with the above three concepts depending on conditions, which are defined by external excitatory drives to CPG half-centers. We show that control of frequency and phase durations within each regime depends on network dynamics, defined by the regime-dependent expression of the half-centers' intrinsic rhythmic capabilities and the operating phase transition mechanisms (escape vs. release). Our study suggests state dependency in locomotor CPG operation and proposes explanations for seemingly contradictory experimental data."
1 . Ausborn J, Snyder AC, Shevtsova NA, Rybak IA, Rubin JE (2017) State-Dependent Rhythmogenesis and Frequency Control in a Half-Center Locomotor CPG. J Neurophysiol [PubMed]
Model Information (Click on a link to find other models with that property)
Model Type: Realistic Network;
Brain Region(s)/Organism:
Cell Type(s):
Channel(s): I Na,t; I Na,p; I K;
Gap Junctions:
Simulation Environment: NSM (web link to model);
Model Concept(s): Oscillations; Temporal Pattern Generation; Activity Patterns;
Search NeuronDB for information about:  I Na,p; I Na,t; I K;
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