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Differential Processing by Two Olfactory Subsystems in the Honeybee Brain.

Julie Carcaud1, Martin Giurfa2, Jean-Christophe Sandoz3

  • 1Evolution, Genomes, Behavior and Ecology, CNRS, Univ Paris-Sud, IRD, Université Paris Saclay, 1 avenue de la Terrasse, 91198 Gif-sur-Yvette, France; Centre de Recherches sur la Cognition Animale, Centre de Biologie Intégrative (CBI), Université de Toulouse, CNRS, UPS, 31062 Toulouse Cedex 9, France.

Neuroscience
|January 29, 2018
PubMed
Summary
This summary is machine-generated.

Honey bees

Keywords:
antennal lobeinsectoptical imagingparallel processingprojection neurons

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Area of Science:

  • Neuroscience
  • Insect Olfaction
  • Sensory Biology

Background:

  • Insects possess a distinct olfactory system with two main projection neuron pathways: medial and lateral antennal lobe tracts (m-ALT and l-ALT).
  • The precise functional roles of these dual olfactory pathways remain incompletely understood.

Purpose of the Study:

  • To investigate how odor quality and quantity are encoded by m-ALT and l-ALT projection neurons in honey bees.
  • To compare the information processing capabilities of the two distinct olfactory pathways.

Main Methods:

  • In vivo calcium imaging was employed to record neural activity.
  • Responses of m-ALT and l-ALT projection neurons were analyzed using a panel of 16 aliphatic odorants and varying concentrations of three odorants.

Main Results:

  • The lateral antennal lobe tract (l-ALT) primarily encodes odorant chain length, while the medial antennal lobe tract (m-ALT) encodes functional groups.
  • Each pathway effectively predicts chemical distances and behavioral responses only for odorants differing in its primary feature.
  • l-ALT neurons exhibited more graded dose-response relationships compared to m-ALT neurons.

Conclusions:

  • The medial and lateral antennal lobe tracts in honey bees process olfactory information in parallel, conveying distinct features of odorants.
  • Differential processing occurs within local networks of each pathway, contributing to specialized odor representation.
  • This study supports a model of parallel odor feature processing in the insect brain.