Adult-born neurons facilitate olfactory bulb pattern separation during task engagement
By W. Li, Monica W. Chu, An Wu, Yusuke Suzuki, Itaru Imayoshi, Takaki Komiyama. 2018
73 citations recorded by the source corpus.
The rodent olfactory bulb incorporates thousands of newly generated inhibitory neurons daily throughout adulthood, but the role of adult neurogenesis in olfactory processing is not fully understood. Here we adopted a genetic method to inducibly suppress adult neurogenesis and investigated its effect on behavior and bulbar activity. Mice without young adult-born neurons (ABNs) showed normal ability in discriminating very different odorants but were impaired in fine discrimination. Furthermore, two-photon calcium imaging of mitral cells (MCs) revealed that the ensemble odor representations of similar odorants were more ambiguous in the ablation animals. This increased ambiguity was primarily due to a decrease in MC suppressive responses. Intriguingly, these deficits in MC encoding were only observed during task engagement but not passive exposure. Our results indicate that young olfactory ABNs are essential for the enhancement of MC pattern separation in a task engagement-dependent manner, potentially functioning as a gateway for top-down modulation.
Subfields: Developmental Neuroscience, Neurology, Sensory Systems
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Citations in the corpus
- Re-evaluating circuit mechanisms underlying pattern separation (2019, positive): “, 2016), a result that parallels recent findings that suggest that adult neurogenesis facilitates pattern decorrelation in the olfactory bulb (Li et al., 2018).”