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Distinct information conveyed to the olfactory bulb by feedforward input from the nose and feedback from the cortex

Author

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  • Joseph D. Zak

    (University of Illinois Chicago
    University of Illinois Chicago)

  • Gautam Reddy

    (Inc.
    Princeton University
    Harvard University)

  • Vaibhav Konanur

    (University of Illinois Chicago)

  • Venkatesh N. Murthy

    (Harvard University
    Harvard University
    Harvard University)

Abstract

Sensory systems are organized hierarchically, but feedback projections frequently disrupt this order. In the olfactory bulb (OB), cortical feedback projections numerically match sensory inputs. To unravel information carried by these two streams, we imaged the activity of olfactory sensory neurons (OSNs) and cortical axons in the mouse OB using calcium indicators, multiphoton microscopy, and diverse olfactory stimuli. Here, we show that odorant mixtures of increasing complexity evoke progressively denser OSN activity, yet cortical feedback activity is of similar sparsity for all stimuli. Also, representations of complex mixtures are similar in OSNs but are decorrelated in cortical axons. While OSN responses to increasing odorant concentrations exhibit a sigmoidal relationship, cortical axonal responses are complex and nonmonotonic, which can be explained by a model with activity-dependent feedback inhibition in the cortex. Our study indicates that early-stage olfactory circuits have access to local feedforward signals and global, efficiently formatted information about odor scenes through cortical feedback.

Suggested Citation

  • Joseph D. Zak & Gautam Reddy & Vaibhav Konanur & Venkatesh N. Murthy, 2024. "Distinct information conveyed to the olfactory bulb by feedforward input from the nose and feedback from the cortex," Nature Communications, Nature, vol. 15(1), pages 1-16, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47366-6
    DOI: 10.1038/s41467-024-47366-6
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    References listed on IDEAS

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