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Multi-neuronal refractory period adapts centrally generated behaviour to reward
Christopher A Harris1, Christopher L Buckley, Thomas Nowotny
1Sussex Centre for Neuroscience, School of Life Sciences, University of Sussex, Brighton, United Kingdom. C.A.Harris@sussex.ac.uk
Plos One
|August 4, 2012
Summary
Researchers discovered a new oscillating neuronal population linked to the feeding central pattern generator (CPG) in Lymnaea stagnalis. This discovery explains how dopamine adapts feeding behavior to food availability by regulating neural circuit activity.
Area of Science:
- Neuroscience
- Animal Behavior
- Computational Biology
Background:
- Central pattern generators (CPGs) produce rhythmic behaviors like walking and breathing.
- Existing CPG models do not fully explain adaptive feeding behaviors in response to environmental rewards.
Purpose of the Study:
- To identify novel neuronal mechanisms underlying adaptive feeding behavior.
- To investigate the role of newly discovered oscillating neuronal populations in CPG function.
Main Methods:
- Utilized multi-electrode array (MEA) recordings in Lymnaea stagnalis.
- Analyzed the activity of the feeding CPG and associated neuronal populations.
Main Results:
- Identified a previously unknown oscillating neuronal population co-active with the feeding CPG.
- This extra-CPG oscillator exhibits periods of high activity and quiescence, rendering the CPG refractory during quiescence.
- Refractory period duration predicts subsequent CPG activation timing.
- Dopamine and food stimuli accelerate the extra-CPG oscillator and shorten quiescence.
Conclusions:
- Dopamine modulates feeding behavior by altering the refractory period of the feeding neural circuitry.
- This mechanism allows for adaptation of feeding behavior to food availability.
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