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Related Experiment Video

Updated: Dec 30, 2025

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Binocular Encoding in the Damselfly Pre-motor Target Tracking System.

Jack A Supple1, Daniel Pinto-Benito1, Christopher Khoo1

  • 1Department of Physiology, Development, and Neuroscience, University of Cambridge, Downing Street, Cambridge CB3 2EG, UK.

Current Biology : CB
|January 21, 2020
PubMed
Summary

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Current biology : CB·2025

Damselflies (Calopteryx) use fused visual fields for frontal prey tracking, unlike dragonflies. Their target-selective descending neurons (TSDNs) adapt to binocular summation, enabling precise predatory behaviors.

Area of Science:

  • Neuroscience
  • Comparative Biology
  • Entomology

Background:

  • Damselflies (Calopteryx) have dichoptic eyes, while many dragonflies have holoptic eyes.
  • Eye morphology influences visual fields and predatory strategies in Odonata.

Purpose of the Study:

  • Compare neuronal correlates of target tracking in damselfly and dragonfly lineages.
  • Link visual overlap changes to pre-motor neural adaptations.

Main Methods:

  • Comparative analysis of neuronal pathways in damselflies and dragonflies.
  • Visual input manipulation using eyepatches and prisms.
  • Identification and functional characterization of target-selective descending neurons (TSDNs).

Main Results:

Keywords:
TSDNdemoiselleevolutionflightinvertebratejewel wingpredationreference framesummationvision

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  • Damselflies attack prey frontally; dragonflies attack dorsally.
  • Demoiselle TSDNs have frontal receptive fields, homologous to dorsal dragonfly TSDNs.
  • Demoiselles utilize binocular summation for target tracking in a fused reference frame, unlike dragonflies' single hemifield responses.

    • Conclusions:

    • TSDNs are conserved in Odonata, but neural inputs and upstream organization differ significantly.
    • Divergence in eye design and predatory strategies drives distinct neural adaptations for target tracking.