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Threat gates visual aversion via theta activity in Tachykinergic neurons
Masato Tsuji1, Yuto Nishizuka1, Kazuo Emoto2,3
1Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
Nature Communications
|July 14, 2023
Summary
Threatened fruit flies (Drosophila) can learn to avoid neutral visual cues. This study identifies tachykinin neurons that gate visual aversion using both activity levels and timing.
Area of Science:
- Neuroscience
- Animal Behavior
- Sensory Processing
Background:
- Animals require adaptive sensory responses for survival, particularly in threatening situations.
- Threatened animals often exhibit heightened aversion to stimuli, including visual ones.
- While threatened Drosophila exhibit defensive states, the mechanisms of visual aversion gating remain unclear.
Purpose of the Study:
- To investigate how mechanical threats influence visual aversion in Drosophila.
- To identify the neural circuits and molecular mechanisms underlying threat-induced visual aversion gating.
Main Methods:
- Utilized Drosophila melanogaster as a model organism.
- Employed mechanical stimuli to induce threat.
- Performed calcium imaging to analyze neural activity in specific neuron clusters.
- Investigated the role of the neuropeptide tachykinin and associated neurons (Tk-GAL42 ∩ Vglut).
Main Results:
- Mechanical threats transiently gate aversion to neutral visual objects in Drosophila.
- A specific cluster of tachykinin-expressing neurons (Tk-GAL42 ∩ Vglut) was identified as crucial for gating visual aversion.
- Mechanical threats are encoded by increased activity in these neurons.
- Visual objects are encoded by θ oscillations within these neurons, causally linked to aversion.
Conclusions:
- A single cluster of tachykinin neurons integrates threat information through both rate and temporal coding.
- These neurons adapt sensory responses to threatening situations by modulating visual aversion.
- The findings reveal a novel mechanism for sensory gating in response to environmental threats.
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