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Stereo olfaction underlies stable coding of head direction in blind mice
Kadjita Asumbisa1, Adrien Peyrache1, Stuart Trenholm2
1Montreal Neurological Institute, McGill University, Montreal, Canada.
Nature Communications
|April 14, 2025
Summary
Stereo olfaction is crucial for mice to create spatial maps using smell. Inhibiting this sense impairs head direction coding and navigation behaviors, demonstrating its necessity for allocentric spatial representation.
Area of Science:
- Neuroscience
- Sensory Systems
- Spatial Navigation
Background:
- Stereo olfaction, the difference in odor concentration between nostrils, influences animal behaviors like olfactory search.
- The role of stereo olfaction in forming allocentric spatial representations remains unclear.
Purpose of the Study:
- To investigate whether stereo olfaction is essential for creating allocentric spatial representations.
- To determine the impact of stereo olfaction on head direction (HD) cell coding and behavior.
Main Methods:
- Recording from head direction cells in the anterior dorsal nucleus of the thalamus in blind mice.
- Inhibiting stereo olfaction by blocking olfactory processing in one nostril or merging airflow.
- Utilizing a closed-loop head direction preference assay with reward stimulation.
Main Results:
- Inhibiting stereo olfaction drastically impaired head direction coding in HD cells.
- Mice with inhibited stereo olfaction showed significant impairment in the head direction preference assay.
- Loss of stereo olfaction disrupted the ability to form stable allocentric spatial representations of head direction.
Conclusions:
- Stereo olfaction is a required sensory input for forming stable allocentric spatial representations of head direction in mice.
- This study highlights the critical role of binaural olfactory cues in spatial cognition and navigation.
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