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Local synaptic inputs support opposing, network-specific odor representations in a widely projecting modulatory

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Network-spanning serotonin neurons in fruit flies use opposing coding schemes to differentiate odor identity and intensity. This highlights serotonin

Keywords:
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Area of Science:

  • Neuroscience
  • Olfactory system
  • Insect models

Background:

  • Serotonin influences neural networks within sensory modalities.
  • Previous work showed odorant-induced inhibition of serotonergic neurons in the Drosophila olfactory system.

Purpose of the Study:

  • Investigate how network-spanning serotonergic neurons encode stimulus features.
  • Determine the coding schemes used by CSDns in different olfactory neuropils.

Main Methods:

  • Whole-cell electrophysiology
  • Functional imaging
  • Computational modeling
  • Electron microscopy reconstruction

Main Results:

  • CSDns exhibit opposing coding schemes in the antennal lobe and lateral horn.
  • Antennal lobe inhibition is odor identity-independent, while lateral horn excitation is odor identity-dependent.
  • Antennal lobe inhibition is mediated by local GABAergic inputs, providing gain control.

Conclusions:

  • Network-spanning serotonergic neurons segregate olfactory information.
  • Opposing coding schemes in different neuropils allow for complex odor processing.
  • GABAergic inhibition in the antennal lobe regulates CSDn function in the lateral horn.