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Articles

A Dynamic Network Simulation of the Nematode Tap Withdrawal Circuit: Predictions Concerning Synaptic Function Using Behavioral Criteria

Stephen R. Wicks, Chris J. Roehrig and Catharine H. Rankin
Journal of Neuroscience 15 June 1996, 16 (12) 4017-4031; DOI: https://doi.org/10.1523/JNEUROSCI.16-12-04017.1996
Stephen R. Wicks
1Program in Neuroscience and
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Chris J. Roehrig
1Program in Neuroscience and
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Catharine H. Rankin
2Department of Psychology, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
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Abstract

The nematode tap withdrawal reflex demonstrates several forms of behavioral plasticity. Although the neural connectivity that supports this behavior is identified (Integration of mechanosensory stimuli in Caenorhabditis elegans, Wicks and Rankin, 1995, J Neurosci 15:2434–2444), the neurotransmitter phenotypes, and hence whether the synapses in the circuit are excitatory or inhibitory, remain uncharacterized. Here we use a novel strategy to predict the polarity configuration, i.e., the array of excitatory and inhibitory connections, of the nematode tap withdrawal circuit using an anatomically and physiologically justifiable dynamic network simulation of that circuit. The output of the modeled circuit was optimized to the behavior of animals, which possessed circuits altered by surgical ablation by exhaustively enumerating an array of synaptic signs that constituted the modeled circuit. All possible polarity configurations were then compared, and a statistical analysis was used to determine whether, for a given synaptic class, a particular polarity was associated with a good fit to behavioral data. The results from four related experiments were used to predict the polarities of seven of the nine cell classes of the tap withdrawal circuit. In addition, the model was used to assess possible roles for two novel mechanosensory integration neurons: DVA and PVD.

  • Caenorhabditis elegans
  • mechanosensory
  • habituation
  • lesion
  • inhibition
  • reflex
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The Journal of Neuroscience: 16 (12)
Journal of Neuroscience
Vol. 16, Issue 12
15 Jun 1996
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A Dynamic Network Simulation of the Nematode Tap Withdrawal Circuit: Predictions Concerning Synaptic Function Using Behavioral Criteria
Stephen R. Wicks, Chris J. Roehrig, Catharine H. Rankin
Journal of Neuroscience 15 June 1996, 16 (12) 4017-4031; DOI: 10.1523/JNEUROSCI.16-12-04017.1996

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A Dynamic Network Simulation of the Nematode Tap Withdrawal Circuit: Predictions Concerning Synaptic Function Using Behavioral Criteria
Stephen R. Wicks, Chris J. Roehrig, Catharine H. Rankin
Journal of Neuroscience 15 June 1996, 16 (12) 4017-4031; DOI: 10.1523/JNEUROSCI.16-12-04017.1996
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Keywords

  • Caenorhabditis elegans
  • mechanosensory
  • habituation
  • lesion
  • inhibition
  • reflex

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