Tonically driven and self-sustaining activity in the lamprey hemicord: When can they co-exist?

Authors:
Mikael Huss;Martin Rehn
Affiliations:
Computational Biology and Neurocomputing, School of Computer Science and Communication, Royal Institute of Technology, 100 44 Stockholm, Sweden;Computational Biology and Neurocomputing, School of Computer Science and Communication, Royal Institute of Technology, 100 44 Stockholm, Sweden
Venue:
Neurocomputing
Year:
2007

Citing 2
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Modelling self-sustained rhythmic activity in lamprey hemisegmental networks

Neurocomputing
Simple model of spiking neurons

IEEE Transactions on Neural Networks

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Abstract

In lamprey hemisegmental preparations, two types of rhythmic activity are found: slower tonically driven activity which varies according to the external drive, and faster, more stereotypic activity that arises after a transient electrical stimulus. We present a simple conceptual model where a bistable excitable system can exhibit the two states. We then show that a neuronal network model can display the desired characteristics, given that synaptic dynamics-facilitation and saturation-are included. The model behaviour and its dependence on key parameters are illustrated. We discuss the relevance of our model to the lamprey locomotor system.