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Dragonfly target-detecting neurons adapt to stimulus saliency.
Matthew B Schwarz1, Bernard J E Evans1, David C O'Carroll2
1School of Biomedicine, The University of Adelaide, Adelaide, Australia.
Vision Research
|October 30, 2025
Summary
Dragonfly neurons adapt to repeated visual targets, reducing responses. Higher contrast and preferred direction increase adaptation, while jittering reduces it, aiding prey detection.
Area of Science:
- Neuroscience
- Animal Behavior
- Sensory Systems
Background:
- Dragonfly visual systems possess neurons, small target motion detectors (STMDs), that detect moving targets amidst clutter.
- These STMDs exhibit facilitation for continuous motion and selective attention for paired targets.
- Rapidly repeated targets induce localized adaptation, decreasing STMD spiking activity.
Purpose of the Study:
- To investigate how dragonfly STMDs adapt their responses to varying target contrast, direction, and motion patterns.
- To explore the interplay between facilitatory and suppressive adaptation mechanisms in STMDs.
- To understand the ecological implications of STMD adaptation for dragonfly flight and prey capture.
Main Methods:
- Extracellular electrophysiology was used to record STMD neuronal activity.
- Rapidly repeating targets with controlled contrast, direction, and jitter were presented.
- Localized adaptation was induced to perturb facilitatory and selective pathways.
Main Results:
- Higher target contrast and preferred direction of movement led to stronger adaptation.
- The time course of adaptation remained consistent across different contrasts.
- Jittering targets induced less adaptation, with adaptation decreasing as jitter radius increased.
- Facilitation effects were observed to compete with suppressive adaptation.
- STMDs showed reduced selective attention to targets moving through adapted visual locations.
Conclusions:
- Dragonfly STMDs exhibit adaptive responses influenced by target saliency and motion characteristics.
- Adaptation mechanisms balance facilitation and suppression, optimizing target detection during flight.
- These findings provide insights into the neural basis of visually guided behavior in dragonflies, crucial for hunting.
