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A Drosophila Circuit for Habituation Override
Swati Trisal1,2,3, Marcia Aranha2, Ankita Chodankar1,2
1National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bangalore 560065, India.
Summary
Habituated fruit flies can regain responses to familiar tastes when encountering novel stimuli. This disinhibition process involves specific neurons, highlighting the role of inhibition in behavioral flexibility.
Area of Science:
- Neuroscience
- Animal Behavior
- Sensory Processing
Background:
- Habituation, a decrease in response to a repeated stimulus, is crucial for filtering information.
- Override of habituation is essential for adapting behavior to changing environments.
- Inhibition is proposed as a key mechanism underlying habituation and its override.
Purpose of the Study:
- To investigate the neural mechanisms underlying the override of gustatory habituation in *Drosophila*.
- To identify specific neuronal populations involved in restoring responses after habituation.
- To elucidate the role of disinhibition in behavioral flexibility.
Main Methods:
- Inducing gustatory habituation using sucrose stimulation in *Drosophila*.
- Employing yeast stimulation and thermogenetic activation of sensory neurons and specific neural populations (TH-positive neurons) to induce habituation override.
- Analyzing the requirement of neurotransmitter release from TH-positive neurons for override.
Main Results:
- Novel taste stimuli (yeast) and activation of sensory neurons or TH-positive neurons can restore habituation of the proboscis extension reflex (PER).
- Override mechanisms specifically affect the habituated state without altering naive responses.
- Sensory-neuron-induced override necessitates transmitter release from TH-positive neurons.
Conclusions:
- Novel taste stimuli trigger dopaminergic neurons that inhibit GABAergic cells, thereby overriding PER habituation.
- This study supports a model where disinhibition by specific neuronal circuits controls behavioral flexibility.
- Findings emphasize the critical role of inhibition and disinhibition in overcoming habituation.
