Discrete functional regions of the olfactory bulb represent region-specific molecular feature sets.

Discrete functional regions in the mouse olfactory bulb group glomeruli with similar odor tuning, separated by functional discontinuities, and show region-specific temporal dynamics independent of response amplitude.

• Why it matters: It remains unclear whether olfactory bulb topography is truly continuous or instead fragmented into discrete odor-tuned zones, and whether molecular features can predict odor responses while mapping to specific spatial regions.
• What they did: Using calcium imaging, the authors measured glomerular odor responses in the mouse olfactory bulb and related functional odor-response space, the 2D bulb surface, and chemical space of molecular features to infer region-specific predictive sets.
• The result: Region-specific molecular feature sets predicted odor responses within each functional region, implying a fragmented tuno- and chemotopic organization with synchronized temporal dynamics that may support local signal processing.

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