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Related Experiment Video

Updated: Nov 19, 2025

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An Anticipatory Circuit Modification That Modifies Subsequent Task Switching.

Yanqing Wang1, Michael A Barry1, Monica Cambi1

  • 1Department of Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York 10029.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 27, 2021
PubMed
Summary

A peptide modulator in Aplysia initially hinders network function but is crucial for task switching. This outward current, induced during egestion, primes the system for subsequent ingestion, demonstrating an anticipatory role in behavior.

Keywords:
Aplysiadynamic clampfeedingmolluscoutward current

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Computational Biology

Background:

  • Peptide modulators typically optimize network configurations for immediate circumstances.
  • A counterproductive network effect was observed, where a modulator impedes appropriate configuration.
  • The study investigates the release of this modulator and its apparent counterproductive effect.

Purpose of the Study:

  • To investigate why a peptide modulator's release, which initially seems counterproductive, occurs.
  • To determine the role of a persistent outward current in the neuron B8 during egestive activity.
  • To elucidate the mechanism underlying negative biasing during task switching in Aplysia.

Main Methods:

  • Experiments were conducted on the Aplysia feeding network, focusing on egestive and ingestive motor programs.
  • The neuron B8's activity and synaptic drive were monitored during egestive activity.
  • Dynamic clamp was used to introduce a persistent outward current into B8 to assess its effect on excitability.
  • An in vitro analog of negative biasing was employed to study the role of the outward current.

Main Results:

  • An outward persistent current develops in neuron B8 during egestive activity, decreasing its excitability.
  • This outward current plays a significant role in establishing negative biasing during egestive-ingestive task switching.
  • The outward current, though counterproductive at the time of induction, plays an anticipatory role in subsequent task switching.

Conclusions:

  • The study identifies a peptide-induced circuit modification (outward current) that initially seems counterproductive but is vital for task switching.
  • The outward current induced during egestion is critical for the negative biasing observed when transitioning to ingestive activity in Aplysia.
  • This mechanism of anticipatory circuit modification for task switching may operate in other species.