Competition for AP initiation sites in a circuit controlling simple learning (Cruz et al. 2007)

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Accession:117459
"The spatial and temporal patterns of action potential initiations were studied in a behaving leech preparation to determine the basis of increased firing that accompanies sensitization, a form of non-associative learning requiring the S-interneurons. ... The S-interneurons, one in each ganglion and linked by electrical synapses with both neighbors to form a chain, are interposed between sensory and motor neurons. ... the single site with the largest initiation rate, the S-cell in the stimulated segment, suppressed initiations in adjacent ganglia. Experiments showed this was both because (1) it received the earliest, greatest input and (2) the delayed synaptic input to the adjacent S-cells coincided with the action potential refractory period. A compartmental model of the S-cell and its inputs showed that a simple, intrinsic mechanism of inexcitability after each action potential may account for suppression of impulse initiations. Thus, a non-synaptic competition between neurons alters synaptic integration in the chain. In one mode, inputs to different sites sum independently, whereas in another, synaptic input to a single site precisely specifies the overall pattern of activity."
Reference:
1 . Cruz GE, Sahley CL, Muller KJ (2007) Neuronal competition for action potential initiation sites in a circuit controlling simple learning. Neuroscience 148:65-81 [PubMed]
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Model Information (Click on a link to find other models with that property)
Model Type: Realistic Network; Neuron or other electrically excitable cell;
Brain Region(s)/Organism: Leech;
Cell Type(s): Leech S cell;
Channel(s): I Na,t; I K,leak;
Gap Junctions:
Receptor(s):
Gene(s):
Transmitter(s): Serotonin;
Simulation Environment: NEURON;
Model Concept(s): Action Potential Initiation; Activity Patterns; Spatio-temporal Activity Patterns;
Implementer(s): Cruz, Ginny [gcruz at monell.org];
Search NeuronDB for information about:  I Na,t; I K,leak; Serotonin;
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CruzEtAlS_cellModel
No5HT
plus5HT
readme.txt
mosinit.hoc
                            
This is the readme for the model associated with the paper:

Cruz GE, Sahley CL, Muller KJ (2007) Neuronal competition for action
potential initiation sites in a circuit controlling simple
learning. Neuroscience 148:65-81

Each model in a folder corresponds to an experiment in the paper,
particularly relative refractory periods with and without 5-HT.  The
2-cell model emulates the electrophysiology and the 3-cell model is a
"biological" representation including synaptic input.

These model files were supplied by Dr Ginny Cruz.