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Divergent co-transmission by a predictive motor circuit modulates auditory processing
Marryn M Bennett1, Han S J Cheong2, Kaitlyn N Boone1
1Department of Biology, West Virginia University, Morgantown, WV, USA.
Current Biology : CB
|July 27, 2026
Summary
Predictive motor circuits in Drosophila use co-transmission to fine-tune auditory processing for distinct behaviors like escape and courtship. This mechanism ensures specific sensory information is modulated differently based on context.
Area of Science:
- Neuroscience
- Animal Behavior
- Sensory Processing
Background:
- Predictive motor circuits adjust sensory processing to anticipate self-generated (reafferent) stimuli.
- Specialized sensory networks can be affected by reafference from the same behavior.
Purpose of the Study:
- To investigate how predictive motor circuits in Drosophila differentially modulate auditory neurons using co-transmission.
- To understand the role of co-transmission in separating sensory processing for distinct behavioral contexts.
Main Methods:
- Identified the metathoracic ascending histamine neurons (MtAHNs) as a predictive motor circuit.
- Analyzed the co-transmission of Dh44 and histamine by MtAHNs.
- Studied the impact of transmitter disruption on auditory neuron networks supporting escape and courtship.
Main Results:
- MtAHNs co-transmit Dh44 and histamine, suppressing auditory neurons in escape and courtship networks.
- Disrupting either transmitter release impairs courtship success.
- Co-transmission of Dh44 is observed in species with auditory courtship but not in those without.
Conclusions:
- Divergent co-transmission by predictive motor circuits efficiently modulates sensory subnetworks affected by common reafferent feedback.
- This mechanism allows for context-specific sensory modulation during behavior.
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