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Modulation and dynamic specification of motor rythm-generating circuits in crustacea
J Simmers1, P Meyrand, M Moulins
1Laboratoire de Neurobiologie et Physiologie Comparees, Universite de Bordeaux I & CNRS, Arcachon, France.
Journal of Physiology, Paris
|January 1, 1995
Summary
Central pattern generators (CPGs) are dynamic neural circuits that adapt motor behaviors. Neuromodulation allows individual neurons to form different CPGs, enabling flexible rhythmic activity and de novo network construction for varied behaviors.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Systems Neuroscience
Background:
- Central pattern generators (CPGs) are neural circuits producing rhythmic motor behaviors.
- CPG function depends on neuronal intrinsic properties and synaptic interactions.
- Neuromodulation dynamically alters neuronal and synaptic properties to adapt CPG output.
Purpose of the Study:
- To challenge the concept of CPGs as discrete, behavior-specific entities.
- To review evidence for neuronal participation in multiple CPGs.
- To highlight dynamic network construction and de novo circuit formation.
Main Methods:
- Review of studies on the crustacean stomatogastric nervous system (STNS).
- Analysis of neuromodulatory effects on neuronal oscillatory and synaptic properties.
- Examination of dynamic network reconfigurations for different behaviors.
Main Results:
- Individual neurons can participate in multiple oscillatory motor circuits.
- Neuromodulation can dismantle existing networks to form new ones.
- De novo network construction relies on altered neuronal properties.
Conclusions:
- CPGs are not fixed entities but dynamic, context-dependent networks.
- Functional CPGs exist transiently, dictated by modulatory influences.
- Neuronal plasticity and neuromodulation are key to flexible motor control.